ellie6705 ellie6705

03-01-2018
Mathematics

contestada

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

Explain

Respuesta :

habeebmusa24 habeebmusa24

03-01-2018

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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