Question

The value of "y" varies directly with "x".

If y = -16, then x = 4.
Solve for k.
k = [?]

Answer 1

k = - 4

Explanation:

given that y varies directly with x, then the equation relating them is

y = kx ← k is the constant of variation

To find k, substitute y = - 16, x = 4 into the equation

- 16 = 4k ( divide both sides by 4 )

- 4 = k