Solve for x, y, z
x=2
y=\frac{a-4}{2}
z=a
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z=2y+2\times 2
Substitute 2 for x in the equation z=xy+2x.
y=\frac{1}{2}z-2 z=a
Solve the second equation for y and the third equation for z.
y=\frac{1}{2}a-2
Substitute a for z in the equation y=\frac{1}{2}z-2.
x=2 y=\frac{1}{2}a-2 z=a
The system is now solved.
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