Question

Qual o valor do X e do Y desse agrupamento de equaçao de adicao:
⅔x+y=3
-2x+2y=1

Answer 1

2x+3y=9-6x+6y
2x+6x=9+6y-3y
8x=9+3y
x=9/8+3/8y , y ∈ R 

Answer 2

veja...

$\frac{2x}{3} +y=3 \\ \\ mmc=3 \\ \\ 2x+3y=9 \\ -2x+2y=1 \\ \\ cancela~~2x-2x=0 \\ \\ 5y=10 \\ y=10\div5 \\ y=2 \\ \\ substituir ~~y~~em \\ \\ 2x+3y=9 \\ 2x+3(2)=9 \\ 2x+6=9 \\ 2x=9-6 \\ 2x=3 \\ x= \frac{3}{2} \\ \\ S=\{( \frac{3}2} ,2)\}$