{2x+y=9 D {5x-4y=3 ________ C {x-2y=3 {-2x+y=0 _______ B {x+4y=-2 {3x-8y=10

{2x+y=9 |*4 {5x-4y=3 8x + 4y = 36 5x - 4y = 3 13x = 39 |:13 x = 3 2x +y = 9 2*3 + y = 9 y = 9-6 y = 3 ________ C {x-2y=3|*2 {-2x+y=0 2x - 4y = 6 -2x + y = 0 -3y = 6 |:(-3) y = -2 _______ B {x+4y=-2 |*2 {3x-8y=10 2x + 8y = -4 3x - 8y = 10 5x = 6|:5 x = 1,2 x + 4y = -2 1,2 + 4y = -2 4y = -2 - 1,2 4y = -3,2 |:4 y = -0,8

2x+y=9 /*4 5x-4y=3 8x+4y=36 5x-4y=3 ------------dodajemy 13x=39 x=3 2x+y=9 y=9-2x y=9-6 y=3 ------------ {x-2y=3 /*2 {-2x+y=0 2x-4y=6 -2x+y=0 -------------- dodajemy -3y=6 y=-2 x-2y=3 x=3+2y x=3-4 x=-1 --------------- {x+4y=-2 /*2 {3x-8y=10 2x+8y=-4 3x-8y=10 -----------dodajemy x=6 x+4y=-2 4y=-2-x y=-1/2-1/4x y=-1/2-1/4*6 y=-2