These Equations as Relations Notes help students to truly understand what it means to be a solution of a linear equation by having them explore them both algebraically and graphically. Special emphasis is placed on the idea that 'infinitely many solutions' does not mean the same thing as 'all solutions' that was used when solving equations with one variable. The back of the page teaches students how to calculate solutions when given the domain. I typically have students work in partners to complete the front side of the paper. We then go over answers as a class and complete the back together.
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