If f(x) varies directly with x, and f(x) = 56 when x = 8, find the value of f(x) when x = 2
A.
4
B.
7
C.
8
D.
14

f(x) varies directly with x, the function is f(x) = kx; f(x) = 56 when x = 8, k = f(x)/x = 56/8 = 7 The function is f(x) = 7x; when x = 2, f(2) = 7(2) = 14

f(x) varies directly with x, the function is f(x) = kx; f(x) = 56 when x = 8, k = f(x)/x = 56/8 = 7 The function is f(x) = 7x; when x = 2, f(2) = 7(2) = 14

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