Question

y varies directly as the square root of x. if y = 50 when x = 5, calculate y when x = 3

Answer 1

Answer:

y varies directly as the square root of x

so, y=k.√x

if y=50, x=5 then,

50=k.√5

=> 2500=5k^2

=> k^2=2500/5

=> k^2=500

=> k=√500=10√5

when x=3

y=k.√3

=10√5.√3

=10√15