Question

sistema de equaçoes com a resposta 10,7

Answer 1

$5x-y=25~.........~equacao~I\\ 2x+y=24~........~equacao~II\\ \\ metodo~da~adicao:\\ \\ some~as~equacoes:\\ \\ ~~~~~~~~5x-y=25\\ ~~+~~2x+y=24\\ ~~~~~------ \\ ~~~~~~~7x+0=49\\ \\ 7x=49\\ \\ x=\frac{49}{7} \\ \\ x=7\\ \\ substitua~(x=7)~em~uma~das~equacoes:\\ \\ equacao~I\\ \\ 5x-y=25\\ \\ 5.7-y=25\\ \\ 35-y=25\\ \\ -y=25-35\\ \\ -y=-10(-1)\\ \\ y=10\\ \\ S=(x=7,~y=10)$