Iforgot how to slove a system of equations algebraically
y=x-1. y=-x+3

X-1=-x+3
2x=4
x=2
plug in for y
y=2-1
y=1

First set x-1 = -x+3 since they're both equal to y.
Then solve for x.
x-1 = -x+3
(x-1)+x = (-x+3)+x
2x-1 = 3
(2x-1)+1 = 3+1
2x = 4
2x/2 = 4/2
x = 2

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