You cannot solve x plus y since that is an expression, not an equation (nor inequality).
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By graphing the lines on the coordinated plane they will intersect at (2, -4) which is the solution of the equations
y=5-x
2x + 2y = 44x + y = 1There are many methods you can use to solve this system of equations (graphing, elimination, substitution, matrices)...but no matter what method you use, you should get x = -1/3 and y = 7/3.
Each and every one of the infinitely many points on the line y + x = -2
solve for y so if x + y = 0 then y = -x