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Algebra 2 Explorations and Applications Chapter 2 Section 2 page 55 Exercises and Applications

For execises 8-13,model each situation with an equation and a graph. Be sure to id

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is this statement true or false and please explain why

-2<3 Determine which two equations represent parallel lines.
(a) y = 9x – 7 (b) y = –9x + 7 (c) y = 9x + 3 (d) y = -1/9x – 7

I have no idea even how to begin to figure this out.