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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?

  • Math -

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

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

  • Math -

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

    2.52 = k(8.4)
    K=0.03
    Y(2.7)=0.03(2.7)=0.81

  • Math -

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

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