if y varues directly as the cube of s, and y=8 when s=2,find y when s=5.

Question

if y varies directly as the cube of s,and y=8 when s=2,find y when s=5.

Answer 1

y varies as the cube of s mean y = ks³.

 

8 = k*2³ => k = 1

 

Then y = 1 * 5³ = 125