Question

2x+y=3
3x+2y=4
descubra o valor de x e de y

Answer 1

$\left\{ \begin{array}{l} 2x+y=3 \\ 3x+2y=4 \end{array}\right.\\\\\left\{ \begin{array}{l} 2x+y=3 (-2)\\ 3x+2y=4 \end{array}\right.\\\\\left\{ \begin{array}{l} -4x-2y=-6 \\ 3x+2y=4 \end{array}\right.\\\\-4x+3x-2x+2x=-6+4\\-x=-6+4\\-x=-2\\x=2\\\\2x+y=3\\2.2+y=3\\4+y=3\\y=3-4\\y=-1$