SOLUTION: Solve the system of equations algebraically. y = x + 4 y = -x

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Question 934077: Solve the system of equations algebraically.
y = x + 4
y = -x
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

y+=+x+%2B+4....eq.1
y+=+-x.......eq.2
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start with
y+=+x+%2B+4....eq.1 ...substitute -x for y from eq.2
-x+=+x+%2B+4...solve for x
-4+=+x+%2B+x
-4+=+2x
-4%2F2+=+x
highlight%28x=-2%29
go to eq.2 substitute -2 for x
y+=+-x.......eq.2
y+=+-%28-2%29
highlight%28y+=+2%29
so, intersection point is (-2,2)