1/3x - 1/2y = 2 1/4x + 1/3y = 1/12 -1/2y = 2- 1/3x 1/4x + 1/3y= 1/12 1/2y = -2 + 1/3x /:1/2 1/4x + 1/3y= 1/12 y= -4 + 2/3x 1/4x + 1/3(-4 + 2/3x) = 1/12 y= -4 + 2/3x 1/4x - 4/3 + 2/9x = 1/12 y= -4 + 2/3x 17/36x = 1/12 + 4/3 y= -4 + 2/3x 17/36x = 17/12 /:17/36 y= -4 + 2/3x x =3 y= -4 + 2/3 *3 x =3 y= -2 x =3
1/3x - 1/2y = 2 /*6 1/4x + 1/3y = 1/12 /* (-12) 2x - 3y = 12 /*3 -3x - 4y = -1 /*2 6x - 9y = 36 -6x - 8y = -2 -17y = 34 / /(-17) y=-2 2x - 3y = 12 2x - 3 * (-2) = 12 2x + 6 = 12 2x = 12 -6 2x = 6 x = 3 y = -2
1/3x - 1/2y = 2 /*6 1/4x + 1/3y = 1/12 /*12 2x-3y=12 3x+4y=1 2x=12+3y /:2 3x+4y=1 x=6+3/2y 3*(6+3/2y)+4y=1 18+9/2y+4y=1 x=6+3/2y x=6+3/2y 9/2y+4y=-17 /*2 x=6+3/2y 9y+8y=-34 17y=-34 /:17 x=6+3/2y y=-2 x=6-3 x=3 y=-2
