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Solve for x, y, z, a
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2+y=1
Consider the second equation. Insert the known values of variables into the equation.
y=1-2
Subtract 2 from both sides.
y=-1
Subtract 2 from 1 to get -1.
z=-1
Consider the third equation. Insert the known values of variables into the equation.
a=-1
Consider the fourth equation. Insert the known values of variables into the equation.
x=2 y=-1 z=-1 a=-1
The system is now solved.