Find the value of y for a given value of x, if y varies directly with x.

If y = 2.52 when x = 8.4, what is y when x = 2.7?

If y directly varies with x that means that we can write:

y = k*x

if we implement y = 2,52 and x = 8,4 we can calculate k

k = y/x = 0.3

now we have k and x and need to find y

y = k*x

y = 0.3 * 2.7 = 0.81

Answer is y = 0.81