Question

Find the constant of variation for the relation and use it to write an equation for the statement. Then solve the equation. If y varies directly as x, and y=5, x-8, find y when x=4

Answer 1

To find y when x = 4.

y = kx (k is a constant)

to find the constant:

5 = k8

8 ÷ 5 = 1.6

k = 1.6

because 5 times 1.6 = 8

so now:

y = kx

y = 1.6 x 4

y= 6.4