Question

Please help!!
solve by subtraction
2x-4y=-10
2x+y=10

Answer 1

x=3; y=4

Explanation:

1. Multiply first equation by (-1)

-2x+4y=10

-2x+4y=102x+y=10

2. Put together both Eq and solve y (this step removes x)

5y=20

5y=20y=4

3. Express x from the original Eq

2x=10-y

x=(10-y)/2

4. Solve x

x=(10-4)/2

x=3