Suppose y varies directly with x, and y equals=20 when x equals = -5. Find x when y equals = 24.
We have
y = k x
And we know that
20 = k (-5) divide both sides by -5
-4 = k
So.......when y = 24, we have
24 = - 4 x divide both sides by -4
-6 = x
+18 
