Solve for a, b
a=-1
b=9
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-2a=1+1
Consider the first equation. Add 1 to both sides.
-2a=2
Add 1 and 1 to get 2.
a=\frac{2}{-2}
Divide both sides by -2.
a=-1
Divide 2 by -2 to get -1.
b=7+2
Consider the second equation. Add 2 to both sides.
b=9
Add 7 and 2 to get 9.
a=-1 b=9
The system is now solved.
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