SOLUTION: use substitution method. If the system has an infinite number of solutions, use set builder notation to writh the solution x+y=-9 x-y=14

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Question 45913: use substitution method. If the system has an infinite number of solutions, use set builder notation to writh the solution
x+y=-9
x-y=14
Answer by Nate(3500) About Me  (Show Source):
You can put this solution on YOUR website!
x+%2B+y+=+-9
y+=+-x+-+9
plug:
x+-+y+=+14
x+-+%28-x+-+9%29+=+14
x+%2B+x+%2B+9+=+14
2x+=+5
x+=+5%2F2
plug:
x+%2B+y+=+-9
5%2F2+%2B+y+=+-18%2F2
y+=+-23%2F2
(2.5,-11.5)
+graph%28600%2C600%2C-10%2C10%2C-12%2C8%2C-x-9%2Cx-14%29+