Question 45840
solve by substitution method 
1st:  x+y=-9
2nd:  x-y=14

Solve 2nd equation for x, as follows:
3rd: x=y+14
Substitute that value of "x" into 1st as follows:

4th: (y+14)+y=-9
     2y==-23
      y=-23/2
Substitute that back into 2nd to solve for "x"
5th: x-(-23/2)=14
     x=-23/2+28/2
     x=5/2
Final Answer: (5/2,-23/2)
Cheers,
Stan H.