SOLUTION: -4x-5y-z=18 -2x-5y-2z=12 -2x+5y+2z=4

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Question 1082205: -4x-5y-z=18 -2x-5y-2z=12 -2x+5y+2z=4
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Use Cramer's rule,
A=%28matrix%283%2C3%2C%0D%0A-4%2C-5%2C-1%2C%0D%0A-2%2C-5%2C-2%2C%0D%0A-2%2C5%2C2%29%29
abs%28A%29=-20
.
.
.
A%5Bx%5D=%28matrix%283%2C3%2C%0D%0A18%2C-5%2C-1%2C%0D%0A12%2C-5%2C-2%2C%0D%0A4%2C5%2C2%29%29
abs%28A%5Bx%5D%29=80
.
.
.

abs%28A%5By%5D%29=0
.
.
.

abs%28A%5Bz%5D%29=40
.
.
.
So,
x=abs%28A%5Bx%5D%29%2Fabs%28A%29=-80%2F20=-4
y=abs%28A%5By%5D%29%2Fabs%28A%29=0
z=abs%28A%5Bz%5D%29%2Fabs%28A%29=-40%2F20=-2