Solve for x, y, z
x=\frac{a-3}{4}
y=0
z=a
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x=-\frac{3}{4}+\frac{1}{4}z z=a
Solve the second equation for x and the third equation for z.
x=-\frac{3}{4}+\frac{1}{4}a
Substitute a for z in the equation x=-\frac{3}{4}+\frac{1}{4}z.
x=-\frac{3}{4}+\frac{1}{4}a y=0 z=a
The system is now solved.
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