Rozwiąż równania: 8(7-4y)-7(4y+1)+5(8y-1)=19 3(2x+1)-5(12x-7)+7(6x-1)=23

8(7-4y)-7(4y+1)+5(8y-1)=19 56-32y -28y -7 + 40y-5 = 19 44 -20y = 19 -20y = 19 - 44 -20y = -25 /: (-20) y = 1,25 3(2x+1)-5(12x-7)+7(6x-1)=23 6x+3-60x+35+42x-7 = 23 -12x + 31 = 23 -12 x = 23 - 31 -12 x = -8 / :(-12) x = 8/12 = 2/3

56-32y-28y-7+40y-5=19 -20y=-25 y-1.25 6x+3-60x+35+42x-7=23 -12x=-8 x=2/3

8(7-4y)-7(4y+1)+5(8y-1)=19 56-32y-28y-7+40y-5=19 44-20y=19 -20y=-25 y=25/20=1 5/20= 1¼ 3(2x+1)-5(12x-7)+7(6x-1)=23 6x+3-60x+35+42x-7=23 -12x+31=23 -12x=-8 x=8/12=2/3