## Elementary Technical Mathematics

$(1\frac{1}{3},-1\frac{1}{3})$
$2x-y=4$ $y=-x$ Substitute -x for y in the first equation. $2x-(-x)=4$ $\longrightarrow$ simplify $3x=4$ $\longrightarrow$ divide both sides by 3 $3x\div3=4\div3$ $\longrightarrow$ simplify $x=1\frac{1}{3}$ Substitute $1\frac{1}{3}$ for x in the second equation. $y=-1\frac{1}{3}$