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Question 804111: {x-y+2z=-7
{y+z=1
{x=2y+3z
Answer by erica65404(394)   (Show Source):
You can put this solution on YOUR website! x-y+2z=-7
0x+y+z=1
add
x+3z=-6
next 2 times x-y+2z=-7
2x-2y+4z=-14
-x+2y+3z=0
add
x+7z=-14
make above graph negative
-x-7z=14
x+3z=-6
add
-4z=8
z=-2
plug in to y+z=1
y-2=1
y=3
plug y and z into x=2y+3z
x=2(3)+3(-2)
x=6-6
x=0
The answer is x=0, y=3, and z=-2.
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