Question

resolva os sistemas de equações do 1o grau 3x+4y=13
X-2y=1

Answer 1

Resposta:

x=3 e y=1

Explicação passo a passo:

$\left \{ {3x+4y=13} \atop {x-2y=1}} \right. \\\left \{ {{3x+4y=13} \atop {(x-2y=1).2}} \right. \\\left \{ {{3x+4y=13} \atop {2x-4y=2}} \right. \\5x+0y=15\\5x=15\\x=\frac{15}{5}\\x=3\\3x+4y=13\\3.3+4y=13\\4y+9=13\\4y=13-9\\y=\frac{4}{4}\\y=1$