Geometrymedium · Past Paper
Find the value of p if the points (1, 1), (2, 3), and (3, p) are collinear.
A4
B5
C6
D7
✓ Correct Answer: B — 5
For collinearity, slopes must be equal: (3-1)/(2-1) = (p-3)/(3-2) => 2/1 = (p-3)/1 => p = 5.
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