The video below might also be helpful.
https://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-linear-equations-functions/8th-solutions-to-two-var-linear-equations/v/plotting-x-y-relationships
Homework: Exercise 2.1 (page 45) #1 (a, b, c, e), #2 – 4 (a, b), #6
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