ISEE Upper Level Mathematics Achievement Quiz
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COORDINATE GEOMETRY
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Points P(-4, 2) and Q(8, -1) lie on line ℓ. If line m is perpendicular to line ℓ and passes through the point R(3, 5), what is the slope of line m?
A
−
1
4
-\frac{1}{4}
−
4
1
B
1
4
\frac{1}{4}
4
1
C
4
4
4
D
−
4
-4
−
4
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