Intro to Systems of Equations with Gallery Walk

This year I ran across a document in my Google Drive that Sonya New and I made in order to introduce solving systems of equations. I decided to do this on the first day back after Christmas break in order to get us "back on track." We have solved systems algebraically and had begun discussing the substitution and elimination methods the week before school let out.

I loved doing the assignment. I only had 6 groups but I still wanted to have them graph all 8 systems so a few groups had 2 systems to graph. I did not call them systems. I just told them to graph both lines on the same coordinate grid. I first allowed them to graph the lines on graph paper and then I had them put them on chart paper. Afterwards I assigned each group a different color marker to write with and had them do a gallery walk and put feedback on the graphs. If they agreed with the graph they put a check mark. If they thought there was an error they had to place an x and then tell what they thought was wrong. The last direction I gave them was to write down the solution to the system of equations. (We have been talking about solutions for systems of equations ALOT in class. I have even OPENED and CLOSED class MULTIPLE TIMES by randomly calling on a student and asking them, "What is the solution to a system of equations?" AND offered candy when they get it correct!! Many of them still don't know. I accept various answers: an x and a y that make both equations true, the point of intersection, an order pair that works for both.... It hurts my feelings but I still haven't gotten it to "sink in.") I had one student in the room that asked me if I meant for them to write the ordered pair down so eventually everyone caught on. Almost every group asked me what I meant by the solution but I would not tell them. I told them to discuss it within their groups because we had talked about it in depth before Christmas. Anyway...after they completed their gallery walk we "debriefed" as a class and settled any differences of opinion. It was a wonderful way to review graphing and reintroduce them to solving systems of equations - we had one no solution and one infinitely many solutions so we also discussed what those would look like algebraically. I did have them solve a couple of the solutions algebraically (using substitution) at the end of class.

Here is the document if you would like it.

OBSERVATIONS:
1. Even my best students needed the graphing review. I had one of the top students in my class put his y-intercepts on the x axis!! I want to do a better job of spiraling my algebra class. I love that our Meaningful Math Algebra books include graphing in every single unit! I hope to incorporate more spiraling review as my warmups this semester.

2. It scares me how much my students forget AND it bothers me that I have to move on when I have so many who have clearly not retained what we have learned.

3. Many of them wrote that the solution was 5 and 2 when they really meant (5,2). They think I am being picky when I make them write the answer as an ordered pair.

4. Students like the opportunity to get out of their seats! I did have some really good student dialogue and I feel that it was a productive first day back after Christmas:)

Quiz retakes and Mystery Bags

Today my Algebra IB students retook their quiz on systems of equations. The majority of my students improved their grade. This semester I have taken two concepts so far and worked hard to try to ensure that my students have mastered them. (This statement actually has me shaking my head...I promise I hope that all my students master all of the topics...but in my experience with struggling math students that doesn't happen.) One of them was graphing lines. We gave them a quiz and then gave the students individual feedback on what they missed. Then we gave a retake for all students who did not ace the first quiz. We did the same thing with systems of equations (substitution and elimination). This topic seems to really get the better of my students every year.

I have been "transforming my teaching" for a couple of years now. For years I taught a topic and then tested it and moved on. There would be some times that I could tell that the students were struggling with a topic and I would reteach it or spend extra days practicing. However, once I taught it and tested I moved on. Well...I still think that you can't sit a topic until every student gets it. I wish I could. However, we would never cover the required objectives if we do that. Sometimes my students either don't care enough to get it or do not come to school enough to get it. So...I have tried to do a better job of giving smaller quizzes on a few topics and then giving the students individual feedback. After the feedback they are given at least one opportunity to retake the quiz (possibly more). I wish we had the time and opportunity to do this with every topic. I truly believe if my students would pay attention in class, do all of their work, and ask questions when they don't understand so that I can help them at their points of confusion they would ALL PASS. However, I do not teach in a perfect world. I do not have perfect students who come to class prepared and ready to learn each day. Also...my students do not have a perfect teacher. So...until these things change I am going to continue to take a few topics each 9 weeks and give students individual feedback with the opportunity to retake. If any of you reading this blog (all 2 of you - haha!) have any ideas that might help this process to be less painful please shoot me an email at towens@attalla.k12.al.us. I thought I would ask...just in case...

Today my 5th period continued working on the 2nd mystery bags activity in Overland Trail. This is definitely a place where we will need to pull extra practice on solving equations. I think that if your students come to your algebra class and they can already solve one and two-step equations successfully then you won't have to supplement as much. However, many of my students still struggle solving basic equations. Therefore, after the More Scrambled Equations and Mystery Bags activity I think I am going to do a quick quiz to assess their fluency on one and two-step equations. The Mystery Bags activities have actually taken them through working on equations with variables on both sides. However, students will need more practice on equations that involve subtraction (integer coefficients). I really believe that referring back to the Mystery Bags context will help. We will see!

IMP Overland Trail - Water Conservation and stopping to find balance...

My 5th period class is Algebra IA year-round. They should be covering Overland Trail and Cookies before the end of the year. I just realized that they are at a point of Overland Trail where I had to skip some of the activities with my Algebra IA Fall Block classes. I was determined to finish Overland Trail by Christmas in order to start Cookies in January.

The Water Conservation activity is another good one to put on chart paper. Most students will generate a chart in order to answer questions 1 and 2. However, I had some students who graphed the lines first and then tried to go back and answer how many gallons each family had left after a given number of days. This did give us the opportunity to discuss how it is easier to be exact when you use a table instead of the graph due to the estimation that is required when looking at the graphs.

I loved that the group that generated the work shown above included the table and the graph along with their answers to the questions. One of the questions that this group did not address is how to find how much water each family has after x amount of days. This forces them to think about the starting point and rate of change. They know to muliply the amount of water used per day times the number of days but then they have to consider that they are trying to give an expression for the amount of water LEFT not the amount of water consumed.

After covering this lesson I pulled some practice problems where graphs were given and we were asked to find equations. I also talked about the slope formula and had them find the slope given 2 points. I know that I need to take time to stop and explicitly teach topics that we have covered but they may not know the "math vocabulary" so I am going to list them here:

• graphing from slope-intercept form
• writing the equation of a line when given a graph
• finding the slope of a line given 2 points
• finding the slope of a line given a graph

Our students have done so much more with this curriculum and creating graphs given real-world circumstances. However, when they take the end-of-course exam and the ACT they are going to need to be familiar with how to do these problems when there is NOT a context. After having taught through this unit (Overland Trail) the first time I realized that there are times I needed to stop and teach the students what types of "traditional algebra" problems they might see from the content we have been covering. The problem was that having never been through the curriculum before I did not want to "steal the thunder" of a lesson that we were going to cover in the future. I feel that to teach using the "exploration/inquiry/problem-based" method you have to also find a balance with showing students what the "traditional/worksheet/drill and practice" version of the algebra looks like. I KNOW that I can do a better job of finding a balance between the two. 

IMP Cookies - Solving Systems of Equations (Only One Variable and The Classic Way to Get the Point)

I love the way the Cookies unit starts with solving systems of inequalities and then works into solving systems of equations. In the Cookies and Inequalities portion of the unit the students are introduced to "real-world" problems where systems of inequalities can be used for solving them. The students practice writing constraints and then graphing the inequalities that go with them. In the real world problems often have more than one possible answer - much like is true of the feasible regions you get when graphing systems of inequalities.

Then, as you try to solve the Cookies unit problem or other problems in the unit involving minimums and maximums you discover that you need to find the "corners" where the lines intersect. We had our students just estimate using their graphs in order to find the points of intersection. However, it is neat to be able to introduce the topic of solving systems of equations by talking about how we really need to be more precise when we find the "corners" of the graph. For a couple of days this week our classes worked on an additional activity that helped them to explore the elimination method.

Today I first had my students do the Only One Variable activity. We had alot of fun with it because we integrated some technology too. Each group had an Ipad and they were projecting their screens using air server/airplay. I gave the group 3 minutes to work on the problem and then after the time was up they had to put something on their screen (they were using the Educreations app). It is so cool to be able to see several samples of student work on the board at the same time. We can critique the work without the class knowing whose work it is. We are able to celebrate different approaches for solving the problem. Also, we are able to talk about common mistakes. They love when they are working on a problem and I point out their work. I can say, "Hey, this person is really moving in the right direction."

Each group's problems projected simultaneously! Cool stuff!

Next we worked on The Classic Way to Get the Point which introduces the substitution method. Mrs. New and I had looked through the rest of this unit and we saw so many activities that give the students the opportunity to practice solving systems again and again. I used to teach these two methods of solving systems of equations separately. Then after covering each method I gave them some "mixed practice" where they had to choose the method to use.  However, I now like the idea of giving them some time to practice a few of each type and then let them decide which method to use as we go. The ACT and other tests are not going to tell them which method to use so they need to learn how to choose which method works better for each type of problem. There are several activities in this portion of the Cookies unit that give them a few more systems of equations to practice solving so hopefully by the time we revisit the topic several times my students will retain the information.