If y varies directly as x , and y is 12 when x is 1 point 2 , what is the constant of variation for this relation?
Answer
A
14 point 4
B
1
C
10
D
10 point 8
Explanation
Direct variation has the form y = kx, where k is the constant of variation. Substitute y = 12 and x = 1.2: k = 12 ÷ 1.2 = 10. So the constant of variation is 10, choice C.
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