$$\left. \begin{array} { l } { 555 - 74 } \\ { x _ { 1 } - 2 x _ { 2 } = 1 } \\ { 2 x _ { 1 } - x _ { 2 } = 5 } \end{array} \right.$$
$a=481$
$$x_{1}=2x_{2}+1$$
$$2\left(2x_{2}+1\right)-x_{2}=5$$
$$x_{2}=1$$ $$a=481$$
$$x_{1}=2\times 1+1$$
$$x_{1}=3$$
$$x_{1}=3$$ $$x_{2}=1$$ $$a=481$$
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