$$\left. \begin{array} { l } { 3 \quad 2 } \\ { 0.2 x + 0.3 y = 1.3 } \\ { 0.4 x + 0.5 y = 2.3 } \end{array} \right.$$
$z=6$
$$x=-1.5y+6.5$$
$$0.4\left(-1.5y+6.5\right)+0.5y=2.3$$
$$y=3$$ $$z=6$$
$$x=-1.5\times 3+6.5$$
$$x=2$$
$$x=2$$ $$y=3$$ $$z=6$$
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