In case you are trying the MARS MAP Classroom Challenges for the first time, it is recommended that you read the Brief Guide for teachers and administrators before you get started.
During the lesson, students work individually on a task that requires them to interpret and solve two equations in two variables. Students then compare and discuss their solutions in small groups.
In the same small groups, students evaluate some sample solutions of the same task.
In a whole-class discussion, students explain and compare the alternative solution strategies they have seen and used.