Question

If y varies directly as x, and y is 48 when x is 6, which expression can be used to find the value of y when x is 2

Answer 1

y = 8(2) = 16

Explanation:

"If y varies directly as x," then y = kx, where k is the constant of proportionality.

Here, when x = 6, y = 48. This data lets us calculate k:

48 = k*6, or k = 8.

Then the pertinent equation is y = 8x.

If x = 2, y = 8(2) = 16