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Which of the following lines are perpendicular to the line x=y in the

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Math Expert
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Re: Which of the following lines are perpendicular to the line x=y in the [#permalink]
CrackVerbalGMAT, how did you solve this? x - y = 2 or y = x - 2. Please correct the way I'm solving this:

x - y = 2
- y = - x + 2
Therefore, slope = -1
Re: Which of the following lines are perpendicular to the line x=y in the [#permalink]
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