https://www.khanacademy.org/math/algebra-home/alg-linear-eq-func/alg-solutions-to-two-var-linear-equations/v/2-variable-linear-equations-graphs
https://www.khanacademy.org/math/algebra-home/alg-linear-eq-func/alg-solutions-to-two-var-linear-equations/v/checking-ordered-pair-solutions-to-equations-2
Homework: Exercise 10.2 (page 29) # 1 – 5 and 7
Challenge! # 8 - 10
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