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

x = - 128

Step-by-step 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