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Find the pair of parallel lines

Find the pair of parallel lines:
1: -y=-x+2
2: -2y-2x=2
3:-2x+2y=2

Not sure how to do the above problem.

Solution Preview

When lines are parallel, their slopes are equal
1: -y=-x+2 =>y=x-2 ...

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This solution is comprised of a detailed explanation to find the pair of parallel lines.

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