\left\{ \begin{array} { l } { 2 a x + b y = 3 } \\ { a x - b y = 1 } \\ { x = 1 } \\ { y = - 1 } \\ { a - 2 b = z } \end{array} \right.
Solve for a, x, b, y, z
x=1
y=-1
z=2
a = \frac{4}{3} = 1\frac{1}{3} \approx 1.333333333
b=-\frac{1}{3}\approx -0.333333333
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