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I understand that perpendicular means two lines meet .I’m unsure about this question

I understand that perpendicular means two lines meet .I’m unsure about this question-example-1
User Misterbear
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Answer:

Well x=-7 is just a vertical line at x=-7 and y=6 is a horizontal line at y=6, so they will meet at (6,-7) and they are perpendicular.

Explanation:

User Janoulle
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