Question

4x + 4y = 40
2x - 4y = 8

Answer 1

x=8 y=2

Explanation:

solve for x

1. 4x+4y=40

2. subtract 4y from both sides

3. 4x=40-4y

4. divide both sides by 40

5.
`(4x)/(4) = (40-4y)/(4)`

6. dividing by four undoes the multiplication by four

7.
`x=(40-4y)/(4)`

8. divide 40 - 4y by 4

9. x=10-y

10. use the last equation to solve the rest