Question 472863
Is the line through points P(1, 9) and Q(9, 6) perpendicular to the line through points R(-6, 0) and S(-9, 8)? Explain.

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Slope m = diffy/diffx
The slope of PQ is -3/8
The slope of RS is 8/-3 = -8/3
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b.
The lines will intersect, but they're not perpendicular.