Question

Y varies inversely with x. if y =40 when x =16, find x when y =-5

Answer 1

x = -128

Explanation:

y varies inversely with x.

xy = k

if y =40 when x =16

40 *16 = k

640 = k

xy = 640

We need to find x when y =-5

x (-5) = 640

Dividee each side by -5

x (-5)/-5 = 640/-5

x = -128