Graph the points for Line AB and Line CD
A(8, 4), B(4, 3), C(4, -9), D(2, -1)
Is the measure perpendicular, parallel, or neither?
My answer is perpendicular according to the slope formula but when you graph it, it's different. There's no intersection. Help please?

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http://upload.wikimedia.org/math/9/d/9/9d9e1aa5fab25d8dd659c0fb6e83234b.png
That's the slope formula

make intersecting lines on a graph

you mean i should draw it?

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