Solve for y, z, a
a=4
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3y=13-4
Consider the first equation. Subtract 4 from both sides.
3y=9
Subtract 4 from 13 to get 9.
y=\frac{9}{3}
Divide both sides by 3.
y=3
Divide 9 by 3 to get 3.
y=3 z=4 a=4
The system is now solved.
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