Solve for x, y, z
x=-a-4
y=-2a-6
z=a
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x=-4-z z=a
Solve the second equation for x and the third equation for z.
x=-4-a
Substitute a for z in the equation x=-4-z.
y=2\left(-4-a\right)+2
Substitute -4-a for x in the equation y=2x+2.
y=-6-2a
Calculate y from y=2\left(-4-a\right)+2.
x=-4-a y=-6-2a z=a
The system is now solved.
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