SOLUTION: solve by the substitution method y=x+8 y=-x+4 I can't seem to set it up right

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Question 157029This question is from textbook a survey of mathematics with applications
: solve by the substitution method
y=x+8
y=-x+4
I can't seem to set it up right This question is from textbook a survey of mathematics with applications

Answer by jojo14344(1513) About Me  (Show Source):
You can put this solution on YOUR website!
y=x%2B8 ---------------> 1
y=-x%2B4 -----------------> 2
Since 1 = 2, equate both:
x%2B8=-x%2B4
x%2Bx=4-8
2x=-4 ---> cross%282%29x%2Fcross%282%29=cross%28-4%292%2Fcross%282%29
x=-2
Substitute in 1 & 2:
y=-2%2B8=6
y=-%28-2%29%2B4=2%2B4=6
: 1 =2
Thank you,
Jojo