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14 January, 08:48

If y varies directly as x and y=12 when x=c what is y in terms of c when x=8

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  1. K
    14 January, 12:42
    0
    "y varies directly as x" means y = kx

    you do not know what k is yet, other than that it is some constant number.

    Now plug in the given values, y=12 when x=4, in the equation

    12 = 4k

    => k = 3

    Now rewrite the equation with the k value you just found

    y = 3k

    Substitute 18 in place of x

    y = 3 (18)

    y = 54
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