\left\{ \begin{array} { l } { \frac { 9 } { 2 } + \frac { b } { 2 } = 850 } \\ { 4 ( a - 6 ) = 600 } \end{array} \right.
Solve for b, a
b=1691
a=156
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9+b=1700
Consider the first equation. Multiply both sides of the equation by 2.
b=1700-9
Subtract 9 from both sides.
b=1691
Subtract 9 from 1700 to get 1691.
a-6=\frac{600}{4}
Consider the second equation. Divide both sides by 4.
a-6=150
Divide 600 by 4 to get 150.
a=150+6
Add 6 to both sides.
a=156
Add 150 and 6 to get 156.
b=1691 a=156
The system is now solved.
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