how do you identify which lines are parallel?
ex. x=7;y=-5/6x+8;y=-5/6x-4;x=-9

Parallel lines have the same gradient. Does that help you at all? I can't say much more without giving it away :)

You should know how to identify the gradient from what you have been taught in class.

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Originally Posted by Capuchin

parallel lines have the same gradient.

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In the US we call it "slope." Parallel lines have the same slope. The general form of a line is y = mx+b, where m is the slope and b is the y-intercept point. You should be able to do these problems now.