\left\{ \begin{array} { l } { a _ { 2 } = 2 } \\ { a _ { 3 } = \frac { 1 } { 1 - a _ { 2 } } } \end{array} \right.
Solve for a_2, a_3
a_{2}=2
a_{3}=-1
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a_{3}=\frac{1}{1-2}
Consider the second equation. Insert the known values of variables into the equation.
a_{3}=\frac{1}{-1}
Subtract 2 from 1 to get -1.
a_{3}=-1
Divide 1 by -1 to get -1.
a_{2}=2 a_{3}=-1
The system is now solved.
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