\left\{ \begin{array} { l } { x + y = 0 } \\ { x = 1 } \end{array} \right.
Solve for x, y
x=1
y=-1
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\left\{ \begin{array} { l } { x + y = 0 } \\ { x = 1 } \end{array} \right.
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1+y=0
Consider the first equation. Insert the known values of variables into the equation.
y=-1
Subtract 1 from both sides. Anything subtracted from zero gives its negation.
x=1 y=-1
The system is now solved.
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