exam Maths Puzzle Numerical Ability

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.

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exam Other Question

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
3^x-5=3