Question

Robert earned $10, which was 4 less than twice what Eric earned , How much money did Eric earn?

Answer 1

Eric's earning is $7

Explanation:

Given

Represent Robert's earnings with R and Eric's with E.

`R = 10\\R = 2E - 4`

Required

What is the value of E?

Substitute 10 for R in the second equation.

`10 = 2E - 4`

Solve for 2E

`2E = 10 + 4`

`2E = 14`

Solve for E

`E = 14/2`

`E = 7`

Eric's earning is $7