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Problem 9 - Entrance Test

If the area of a triangle with vertices (0, 0), (6, 0) and (0, y) is 15 sq units, then y equals

Correct: A

Area = 1/2 |x₁(y₂–y₃)+...| = 1/2 |6y| = 15 → 3|y| = 15 → |y| = 5 → y = 5.