Question

If y varies directly with x which equation describes x = 72 and y = 36?

Answer 1

k = 1/2

Explanation:

direct variation equation is y = kx where 'k' is the constant of variation

substitute 36 for 'y' and 72 for 'x' to get:

36 = 72k

solve for 'k' to get:

k = 36/72 or k = 1/2