If f(x) varies directly with x, and f(x) = 45 when x = 9, find the value of f(x) when x = 3. A. 5 B. 9 C. 15 D. 27
f(x) varies directly with x, the equation is f(x) = kx where k is the constant. f(x) = 45 when x = 9, then k = f(x)/x = 45/9 = 5. The equation is f(x) = 5x. When x = 3, f(3) = 5(3) = 15
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Updated 6/11/2014 5:10:10 AM
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f(x) varies directly with x, the equation is f(x) = kx where k is the constant. f(x) = 45 when x = 9, then k = f(x)/x = 45/9 = 5.
The equation is f(x) = 5x.
When x = 3, f(3) = 5(3) = 15

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