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Dido525
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Okay. Do you know how to find slope?

KierseyClemons
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no

Dido525
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Okay:
\[slope=\frac{ y2y1 }{ x2x1 }\]

Dido525
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We are given two sets of points. So we can use this formula. Do you understand?

KierseyClemons
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yes thank you

Dido525
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Wait. Remember that perpendicular slope is just the negative reciprocal of your slope.