Question

y varies directly as the square of r. If y=162 when r=9, find y when r=5. Y=?

Answer 1

50

Answer 2

y varies directly withsquare of r
y=kr^2 k is a constant
y=162 when r=9
162=k*81
k=2
y=2r^2
r=5
y=2*5^2
y=50

Answer 3

50