Answer:
When y = 15, x = -5.
Step-by-step explanation:
"y varies directly with x" signifies the linear relationship y = kx, where k is the constant of proportionality.
Substituting 6 for y and -2 for x into this equation yields the value of k:
6 = k(-2), or k = -6/2, or k = -3
Then the proportional relationship is y = -3x.
If y = 15, then we can write 15 = -3x, or x = -15/3, or x = -5.
When y = 15, x = -5.