{x-2y=3 {-2x+y=0

{x-2y=3 {-2x+y=0 |*2 {x-2y=3 +{-4x+2y=0 __________ -3x=3|:(-3) x=-1 -1-2y=3 -2y=4|:(-2) y=-2

{x-2y=3 |*2 {-2x+y=0 {2x-4y=6 {-2x+y=0 -3y= 6 |/-3 y= -2 y=-2 2x+8=6 y=-2 2x= -2 |/2 y=-2 x=-1

x-2y=3 -2x+y=0 x=3+2y -2(3+2y)+y=0 x=3+2y -6-4y+y=0 x=3+2y -6-3y=0 x=3+2y -3y=6I:(-3) x=3+2y y=-2 x=3+2*(-2) y=-2 x=3-4 y=-2 x=-1