Question

resolva o sistema:

2x+y=5

x+2y=4

Answer 1

X=4-2y


2x+y=5
2(4-2y) + y= 5
8 - 4y +y=5
-3y=5-8
-3y=-3
Y=1.


X +2y=4
X+2(1)=4
X+2=4
X= 2.

Answer 2

(-2). (2x+y=5)
        x+2y=4

-4x-2y=-10
x+2y=4

(-4x+x)+(-2y+2y)=-10+4
-3x+0=-6
-3x=-6
x=-6/-3
x=2

2+2y=4
2y=4-2
2y=2
y=2/2
y=1

SENDO ASSIM X=2 E Y=1