Question

What is the value of x in the equation 1/5x - 2/3y = 30, when y = 15?

4
8
80
200

Answer 1

x = 200

Explanation:

substitute y = 15 into the equation

`(1)/(5)` x - (
`(2)/(3)` × 15) = 30

`(1)/(5)` x - (2 × 5) = 30

`(1)/(5)` x - 10 = 30 ( add 10 to both sides )

`(1)/(5)` x = 40 ( multiply both sides by 5 to clear the fraction )

x = 5 × 40 = 200