solve x+8=9; y+x=7

To solve x+8=9, we need to isolate x on one side of the equation. Subtracting 8 from both sides, we get: x+8-8=9-8 x=1

To solve y+x=7, we can substitute the value we found for x into the equation: y+1=7 Subtracting 1 from both sides, we get: y=6

Therefore, the solution is x=1 and y=6.