\left\{ \begin{array} { l } { a + b = 20 } \\ { a + 300 = 383 } \end{array} \right.
Solve for a, b
a=83
b=-63
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a=383-300
Consider the second equation. Subtract 300 from both sides.
a=83
Subtract 300 from 383 to get 83.
83+b=20
Consider the first equation. Insert the known values of variables into the equation.
b=20-83
Subtract 83 from both sides.
b=-63
Subtract 83 from 20 to get -63.
a=83 b=-63
The system is now solved.
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