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Solving Systems of Linear Equations

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X+y-z=6 (four problems)
y+z=11
y-z=3

x+y+z=2
x+2y-z=6
2x+y-z=5

2x-y+z=10
3x-2y-2z+7
x-3y-2z=10

x+y =7
y- z = -1
x + 3z = 18

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Solve each system of equations
A.
x+y-z=6 (1)
y+z=11 (2)
y-z=3 (3)

(2)+(3)
, plug into (2)
, plug y and z into (1)

So the solutions are ...

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