The value of `y` varies directly with `x` ,and `y=12` when `x=10` .Find `y` when `x=25`

y varies inversely with x. If y = 30 when x = 12 find y when x = 15

y varies inversely with x. If y = 30 when x = 12, find x when y = 18

If y varies directly as x and y=12, where x=c, what is y in terms of c when x=8 ?

A variable is the sum of two such quantities one of which varies directly with x and the other varies directly with x^2 . If y =3 when x =1 and y=10 when x=2 , then find the relation between x and y .

If x varies inversely as y and y = 60 when x = 1.5. Find x. when y = 4.5.

If x varies inversely as y and x = 20 when y = 600, find y when x = 400