$$\left. \begin{array} { l } { 2 x + y - 10 = 0 \quad 3 x - y - 10 = 0 } \\ { = 00.00120000003000000209 } \end{array} \right.$$
$x=-y$
$$2x+y-10=0x-y-10$$
$$2x+y-10=0-y-10$$
$$2x+y-10=-10-y$$
$$2x-10=-10-y-y$$
$$2x-10=-10-2y$$
$$2x=-10-2y+10$$
$$2x=-2y$$
$$\frac{2x}{2}=-\frac{2y}{2}$$
$$x=-\frac{2y}{2}$$
$$x=-y$$
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