Solve for x, y, z
x=a+3
y=-a
z=a
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x=z+3 z=a
Solve the second equation for x and the third equation for z.
x=a+3
Substitute a for z in the equation x=z+3.
y=3-\left(3+a\right)
Substitute 3+a for x in the equation y=3-x.
y=-a
Calculate y from y=3-\left(3+a\right).
x=a+3 y=-a z=a
The system is now solved.
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