Question

Suppose y varies directly as x. if y = 3 when x = 15, find when y = 5.​

Answer 1

X = -9

Explanation:

y = k X for some fixed number constant k.

-5 = k (15)

k = -5/15 = -1/3

So y = (-1/3)X

When y = 3 ---> 3 = (-1/3)X

X = -9