\left\{ \begin{array} { l } { x + y = 18 } \\ { x - 7 = 2 } \end{array} \right.
Solve for x, y
x=9
y=9
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x=2+7
Consider the second equation. Add 7 to both sides.
x=9
Add 2 and 7 to get 9.
9+y=18
Consider the first equation. Insert the known values of variables into the equation.
y=18-9
Subtract 9 from both sides.
y=9
Subtract 9 from 18 to get 9.
x=9 y=9
The system is now solved.
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