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11 April, 23:46

If y varies directly with x and y=30 when x=-10, find the value of x when y=4

A. - 4/3

B. 4/3

C. - 3

D. - 12

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Answers (1)
  1. 11 April, 23:56
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    If y∞x then y=kx where k is constant to find k

    k=y/x then substitute the values

    k=30/-10=-3 to find x when y is 4

    x=y/k=4/-3=-4/3 option A
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