in this question, it is hard and I can't solve it. can any of you guys help me?
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When two lines are parallel they have the same gradient, which means that the x coefficient is the same for each when the equations are both in standard form y=mx+b.

2y-2a=6x is the same as y=3x+a so the gradient is 3.

y=(a+6)x-1 so a+6=3 and a=-3.

by Top Rated User (651k points)

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