Suppose y varies directly with x, and y=8 when x = -4. Find x when y = 12
We can use the formula for direct variation, which is:
y = kx
where k is the constant of variation. To find k, we can use the given values:
8 = k(-4)
Solving for k, we get:
k = -2
Now we can use this value of k to find x when y = 12:
12 = (-2)x
Solving for x, we get:
x = -6
Therefore, when y = 12, x = -6.