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

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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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