\left\{ \begin{array} { l } { x _ { 3 } = x + x _ { 1 } } \\ { x = 2 } \\ { x _ { 1 } = 3 } \end{array} \right.
Solve for x_3, x, x_1
x=2
x_{3}=5
x_{1}=3
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x_{3}=2+3
Consider the first equation. Insert the known values of variables into the equation.
x_{3}=5
Add 2 and 3 to get 5.
x_{3}=5 x=2 x_{1}=3
The system is now solved.
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