Question

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

12.5

Explanation:

y= kx

k= y/x

x= 5, y= 12

k = 12/5

Therefore the value of x when y is 30 can be calculated as follows

y = kx

30= 12/5x

x= 30÷12/5

x= 30× 5/12

x= 150/12

x= 12.5