d) (x+1)/3 - (y + 2)/4 = 2(x - y)/5 /*60 (x-3)/4 - (y - 3)/3 = 2y - x /*12 20x+20-15y-30=24x-24y 3x-9-4y+12=24y-12x 20x-24x-15y+24y=30-20 3x+12x-4y-24y=-12+9 -4x+9y=10 /*15 15x-28y=-3 /*4 -60x+135y=150 60x-112y=-12 23y=138 /:23 y=6 -4x+9*6=10 -4x+54=10 -4x=10-54 -4x=-44 /:(-4) x=11 x=11 y=6 h) 11/20 y - 0,8 (1/4 x + 2,5) = 2 1/2 /*20 (6x - 0,3y)/2 - 1 1/2 = 2(1 + x) /*2 11y-1,6(1/4x+2,5)=50 6x-0,3y-3=4+4x 11y-0,2x-2=50 6x-4x-0,3y=4+3 -0,2x+11y=52 /*10 2x-0,3y=7 -2x+110y=520 2x-0,3y=7 109,97y=7 /:(109,97) y=700/10997 -0,2x+11*700/10997=52 -0,2x+7700/10997=52 -0,2x=52-7700/10997 -0,2x=51 3297/10997 /(-0,2) x=-2820720 x=-2820720 y=700/10997
d) x+1/3-y+2/4=2x-2y/5 /60 x-3/4-y-3/3= 2y-x 20x+20-15y-30=24x-24y 3x-9-4y+12=24y-12x - 4x+9y=10 /15 15x-28y= - 3 /4 - 60x + 135y = 150 60x - 112y= - 12 23y= 138 y= 6 x = 11
d) (x+1)/3 - (y + 2)/4 = 2(x - y)/5 /*60 (x-3)/4 - (y - 3)/3 = 2y - x /*12 20x+20-15y-30=24x-24y 3x-9-4y+12=24y-12x 20x-24x-15y+24y=30-20 3x+12x-4y-24y=-12+9 -60x+135y=150 60x-112y=-12 23y=138 /:23 y=6 -4x+9*6=10 -4x+54=10 -4x=10-54 -4x=-44 /:(-4) x=11 x=11 y=6 h) 11/20 y - 0,8 (1/4 x + 2,5) = 2 1/2 /*20 (6x - 0,3y)/2 - 1 1/2 = 2(1 + x) /*2 11y-1,6(1/4x+2,5)=50 6x-0,3y-3=4+4x 11y-0,2x-2=50 6x-4x-0,3y=4+3 -0,2x+11y=52 /*10 2x-0,3y=7 109,97y=7 /:(109,97) y=700/10997 -0,2x+11*700/10997=52 -0,2x+7700/10997=52 -0,2x=52-7700/10997 -0,2x=51 3297/10997 /(-0,2) x=-2820720 x=-2820720 y=700/ 10997