Students need to know how to use the addition method, substitution and graphing method of solving equations in two variables. Students and teams number off. Teacher poses a problem. Students take one or two minutes to work the problem individually. Teacher announces that it is time to huddle.
Students huddle in teams and compare work and answers.
If one does not understand, the team members help. Teacher calls time. Students stop discussing. Teacher spins student spinner. Students with that number stand without talking.