Question

Maria wants to solve the following system using the elimination method: 4x+9y=59 and x+y=17What number should the equation x+y=17 be multiplied by to eliminate y

Answer 1

`\left\{\begin{array}{ccc}4x+9y=59\\x+y=17&|multiply\ both\ sides\ by\ (-9)\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}4x+9y=59\\-9x-9y=-153\end{array}\right}\\.\ \ \ -5x=-94`