I am still having so much trouble with systems of equations with 3 variables!! Can anyone help me out?
One of my problems is:
x+y-z=-1
x+y+z=3
3x-2y-z=-4

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I meant the value of y.
\[3(1-y)-2y-((1-y)+y+1)=-4\]\[3-3y-2y-2=-4\]\[-5y=-5\]\[y=1\]

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