Solve for x, y, z, a
a=2
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z=2\left(-1\right)+7-3
Consider the third equation. Insert the known values of variables into the equation.
z=-2+7-3
Multiply 2 and -1 to get -2.
z=5-3
Add -2 and 7 to get 5.
z=2
Subtract 3 from 5 to get 2.
a=2
Consider the fourth equation. Insert the known values of variables into the equation.
x=-1 y=7 z=2 a=2
The system is now solved.
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