Question

If y varies directly as x, and y = 3 when x = 9, how will you find x when y = 36?

Answer 1

(Some textbooks describe direct variation by saying " y varies directly as x ", " y varies proportionally as x ", or " y is directly proportional to x . ") This means that as x increases, y increases and as x decreases, y decreases—and that the ratio between them always stays the same.

Explanation: