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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
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Asked 3/25/2014 5:10:17 PM
Updated 4/13/2014 11:11:51 PM
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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
Added 4/13/2014 11:11:51 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [4/13/2014 11:15:03 PM], Rated good by 5sosZ
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