Question

Suppose y varies directly with x. If y = –20 when x = 2, find y when x = 14

Answer 1

y = -140

Explanation:

Y varies directly with x

y = kx

We know y = -20 when x =2, we can solve for k

-20 = k*2

Divide each side by 2

-20/2= 2k/2

-10 =k

y = -10x

Now we want to find y when x = 14

y = -10 *14

y = -140