Find the value of y for a given value of x, if y varies directly with x.

If y = –252 when x = 84, what is y when x = 74?

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  1. y = kx
    -252 = k(84)
    k = -3

    y(74) = -3(74) = -222

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  2. Do the same thing with X 6, 18, 54, 162
    Y 24, 72, 216, 640

    2.52 = k(8.4)

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  3. f(x)=4x+7,find f(4)

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  4. Find the value of x when y=24

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