Solve for x, y, z, a
a=-13
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z=-\left(-7\right)-4\times 5
Consider the third equation. Insert the known values of variables into the equation.
z=7-4\times 5
The opposite of -7 is 7.
z=7-20
Multiply -4 and 5 to get -20.
z=-13
Subtract 20 from 7 to get -13.
a=-13
Consider the fourth equation. Insert the known values of variables into the equation.
x=-7 y=5 z=-13 a=-13
The system is now solved.
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