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Problem 13 - Entrance Test

If the points (2,3), (4,k), (6,-3) are collinear, then k equals

Correct: A

Slope equality: (k-3)/(4-2) = (-3-k)/(6-4) → (k-3)/2 = (-3-k)/2 → k-3=-3-k → 2k=0 → k=0.