## Elementary Technical Mathematics

Add the 2 equations. $\ \ -2x+5y=\ \ \ 39$ $\underline{\ \ \ \ \ \ \ 2x-3y=-25}$ $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 2y=\ \ \ \ 14$ divide both sides by 2 $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ y=\ \ \ \ \ \ 7$ Substitute and solve for x. $2x-3y=-25$ $2x-3(7)=-25$ $2x-21+21=-25+21$ $2x=-4$ $2x\div2=-4\div2$ $x=-2$