\left\{ \begin{array} { l } { v _ { 1 } - \frac { 1 } { 2 } v _ { 2 } = - 7 } \\ { - \frac { 1 } { 2 } u _ { 1 } + 2 v _ { 2 } = 4 } \end{array} \right.
Solve for v_1, v_2, u_1
v_{1}=\frac{u_{1}-48}{8}
v_{2}=\frac{u_{1}+8}{4}
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