Question

Find the constant of variation k. Write the answer as an integer or simplified fraction.

y varies directly as X. When x = 9, y = 18.

Answer 1

k = 2

Explanation:

y varies directly as x: y = kx (for some constant, k)

when x = 9 and y = 18: 18 = 9k

⇒ 2 = k

Therefore, k = 2