Y varies inversely with the square of x. y is also proportional to the cube of z.
When x =
= 3, y = 80
When x
2,2= 5
Calculate y when z = 15.
Someone please help

y=−9/2x+10

step-by-step explanation:

let's solve for y.

0−9x−2y=−20

step 1: add 9x to both sides.

−9x−2y+9x=−20+9x

−2y=9x−20

step 2: divide both sides by -2.

−2y

−2

=

9x−20

−2

y=

−9

2

x+10

the answer is y < -3 or   y > 3

-3y > 7 + 2

-3 y > 9

y < -3