Geometryhard · Past Paper
The points (k, 2-2k), (1-k, 2k), and (-4-k, 6-2k) are collinear if k is:
A1/2 or -1
B1
C0
D-1
✓ Correct Answer: A — 1/2 or -1
Set the area of triangle to zero and solve for the quadratic in k.
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