If y varies directly as x, and y is 12 when x is 1.2, what is the constant of variation for this relation?
Answer
A
1
B
10
C
10.8
D
14.4
Explanation
For direct variation, y = kx, where k is the constant of variation. Substitute y = 12 and x = 1.2: k = 12 ÷ 1.2 = 10. The constant of variation is 10, choice B.
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