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Solve for a, b
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-a=16-21
Consider the first equation. Subtract 21 from both sides.
-a=-5
Subtract 21 from 16 to get -5.
a=\frac{-5}{-1}
Divide both sides by -1.
a=5
Fraction \frac{-5}{-1} can be simplified to 5 by removing the negative sign from both the numerator and the denominator.
-b=15-4
Consider the second equation. Subtract 4 from both sides.
-b=11
Subtract 4 from 15 to get 11.
b=-11
Divide both sides by -1.
a=5 b=-11
The system is now solved.