SOLUTION: I need help with this: Solve these equations by addition. 2x + y = -2 x + y = 5 The lines intersect at(?,?). it's not (3,-8) or (3,2). thank you

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Question 256398: I need help with this:
Solve these equations by addition.
2x + y = -2
x + y = 5
The lines intersect at(?,?).
it's not (3,-8) or (3,2).
thank you

Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
2x + y = -2 multiply by -1 & add.
x+y=5
-2x-y=2
----------------------
-x=7
x=-7 ans.
2*-7+y=-2
-14+y=-2
y=-2+14
y=12 ans.
(-7,12) is the intersection.
Proof:
-7+12=5
5=5
+graph%28+300%2C+200%2C+-8%2C+5%2C+-10%2C+14%2C+-2x+-2%2C+-x+%2B5%29+ (graph 300x200 pixels, x from -8 to 5, y from -10 to 14, of TWO functions -2x -2 and -x +5).