3 years ago

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

1 answer:

4 0

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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