$\left \{ {{2x-3y=7} \atop {3x+2y=4}} \right.$ $\left \{ {{6x-9y=21} \atop {6x+4y=8}} \right.$ $\left \{ {{-13y=13} \atop {2x-3y=7}} \right.$ $\left \{ {{y=2} \atop {x=2}} \right.$ $\left \{ {{y=-1} \atop {x=2}} \right.$ Bình luận
2x-3y=7 ⇔[4x-6y=14 ⇔[x=2 ⇔[x=2
3x+2y=4 ⇔[9x+6y=12 ⇔[3x2y=4 ⇔y=-1
vậy…
$\left \{ {{2x-3y=7} \atop {3x+2y=4}} \right.$
$\left \{ {{6x-9y=21} \atop {6x+4y=8}} \right.$
$\left \{ {{-13y=13} \atop {2x-3y=7}} \right.$ $\left \{ {{y=2} \atop {x=2}} \right.$
$\left \{ {{y=-1} \atop {x=2}} \right.$