Solve for y, x, a
x=80
y=50
a=20
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x=180-2y
Solve 180=2y+x for x.
180=2\left(180-2y\right)+a
Substitute 180-2y for x in the equation 180=2x+a.
y=90-2a a=-180+4y
Solve the second equation for y and the third equation for a.
a=-180+4\left(90-2a\right)
Substitute 90-2a for y in the equation a=-180+4y.
a=20
Solve a=-180+4\left(90-2a\right) for a.
y=90-2\times 20
Substitute 20 for a in the equation y=90-2a.
y=50
Calculate y from y=90-2\times 20.
x=180-2\times 50
Substitute 50 for y in the equation x=180-2y.
x=80
Calculate x from x=180-2\times 50.
y=50 x=80 a=20
The system is now solved.
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