Question

Resolva:
$\left \{ {{2x+y=5} \atop {2x+3y=2}} \right.$

Answer 1

 Olá,

$\left \{ {{2x+y=5.(-)} \atop {2x+3y=2.(+)}} \right.$

$\left \{ {{-2x-y=-5} \atop {+2x+3y=+2}} \right.$

$2y=-3$
$y= \frac{-3}{2}$
$y=-1,50$

$2x+.(-1,50)=5$
$2x-1,50=5$
$2x=5+1,50$
$2x=6,50$
$x= \frac{6,50}{2}$
$x=3,25$

Então: Y=-1,50  e  x=3,25

ESPERO TER AJUDADO!! :D

Answer 2

y=5-2x
2x+3.(5-2x)=2
2x-6x=2-15
-4x=-13 .(-1)
+4x=+13
x=$\frac{13}{4}$
y=5-2.$\frac{13}{4}$
y=$\frac{21}{4}$
$( \frac{13}{4}, \frac{21}{4} )$