SOLUTION: 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. (th

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Question 104978: 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. (the above is a fraction)
I put this on before but did not understand the answer. Sorry I am not so good at math.

Answer by checkley75(3666)   (Show Source): You can put this solution on YOUR website!
a & c are parallel lines because they have the same slope (m=9).
the line formula is Y=mX+b

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