Question

sistema dois por dois
5x +2y =7
3x-y=2​

Answer 1

Resposta:

(x,y)=(1,1)

Explicação passo-a-passo:

$\left \{ {{5x+2y=7} \atop {3x-y=2}} \right. \\\\\left \{ {{5x+2y=7} \atop {y=-2+3x}} \right. \\\\5x+2(-2+3x)=7\\\\x=1\\\\y=-2+3.1\\\\y=1\\\\(x,y)=(1,1)\\\\\left \{ {{5.1+2.1=7} \atop {3.1-1=2}} \right. \\\\\left \{ {{7=7} \atop {2=2}} \right. \\\\(x,y)=(1,1)$

Espero ter ajudado!!