The value of y varies directly with x. If x=5 when y=12, what is the value of x when y=30

Answer 1

y=kx

12=k(5)

k=12/5

y = (12/5)x

30= 12x/5

12x = 150

x = 150/12 = 50/4 = 25/2

x = 25/2 = 12.5

y is 2.4 times x. 5(2.4) = 12

30 =2.4x

x = 30/2.4 = 15/1.2 = 5/.4 = 50/4 = 25/2 = 12.5