Question

conta armada 2x+y=3x-y=6

Answer 1

Resposta:

$~~~~~~~~~~2x+y=3\\ +~~~~~~~~~x-y=6\\ ~~~~~~~~~-------\\ ~~~~~~~~~~~~3x+0=9\\ \\ 3x=9\\ \\ x=\frac{9}{3} \\ \\ x=3\\ \\ \\ 2x+y=3\\ \\ 2*3+y=3\\ \\ 6+y=3\\ \\ y=3-6\\ \\ y=-3\\ \\ \\ S\left \{ {{3;-3} {}} \}$