SOLUTION: please solve the system: x+y=-5 x-y=12

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Question 56256: please solve the system:
x+y=-5
x-y=12
Answer by Cintchr(481) About Me  (Show Source):
You can put this solution on YOUR website!
Add the two equations.
+x%2By=-5+
+x-y=12+
________
+2x+=+7
+x+=+7%2F2+
Plug this into one of two equations
+x-y=12+
+7%2F2+-y+=+12+
+7%2F2+-y+=+24%2F2+
+-y+=+17%2F2+
+y+=+-17%2F2+