Variation Equation

Question

If z varies inversely as w², and z=10 when w=6, find z when w=4

Answer 1

Inverse variation means

z₁ / w₁² = z₂ / w₂²

Plug in

z₁ = 10

w₁ = 6

w₂ = 4

and solve for z₂. You should be able to finish from here.