Algebra problem about linear equations, help ASAP!?

this is about solving system of linear equation in two variables. how do you solve this equation using the substitution method! 1/2(x+y)+1=0 1/2(x-y)=2 or if you're too lazy just answer me how i can solve it! i'm not really good at fractions. the third equation is 4+y. but i can't find the... show more this is about solving system of linear equation in two variables.

how do you solve this equation using the substitution method!

1/2(x+y)+1=0
1/2(x-y)=2

or if you're too lazy just answer me how i can solve it! i'm not really good at fractions. the third equation is 4+y. but i can't find the ordered pair that will satisfy the equation. please help!
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