Systems of linear equations:
Based on our practice PARCC. I suggest reviewing the following lesson on Khan Academy:
https://www.khanacademy.org/math/high-school-math/algebra/algebra-functions/recognizing-functions-ddp/v/graphical-relations-and-functions
https://www.khanacademy.org/math/high-school-math/algebra/algebra-functions/recognizing-functions-ddp/v/graphical-relations-and-functions
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