$$\left. \begin{array} { l } { ( x + y ) = } \\ { ( x - y ) } \\ { x = \frac { 1 } { 4 } y = \frac { 3 } { 2 } } \end{array} \right.$$
$z=-\frac{5a}{3}$
$$z=\frac{1}{4}y+y$$ $$a=\frac{1}{4}y-y$$
$$z=\frac{5}{4}y$$ $$y=-\frac{4}{3}a$$
$$z=\frac{5}{4}\left(-\frac{4}{3}\right)a$$
$$z=-\frac{5}{3}a$$
$$x=\frac{1}{4}\left(-\frac{4}{3}\right)a$$
$$x=-\frac{1}{3}a$$
$$x=-\frac{1}{3}a$$ $$y=-\frac{4}{3}a$$ $$z=-\frac{5}{3}a$$
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