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Triangle (0,0), (6,0), (0,k) has area 9 square units. Find all k.
A3 or -3
B1.5 or -1.5
C9 only
D6 or -6
Answer & Solution
Correct answer: A. 3 or -3
The area is half of 6 times |k|, so 3|k| = 9, giving |k| = 3 and k = 3 or -3.
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