Question

If the value of "Y" varies directly with "X" and y=-8,when x=20,find "Y"if x=-4

Answer 1

y is 8/5 when x = -4.

Explanation:

If the value of "Y" varies directly with "X", we can write y = kx, where k is the constant of proportionality.

If "y=-8,when x=20," then we can find k: -8 = 20k, or k = -2/5.

Then y = (-2/5)x.

If x = -4, then y = (-2/5)(-4) = 8/5

y is 8/5 when x = -4.