1. Rozwiąż układy równań metoda podstawiania: a. < 1/2x - 2y = 8 < 2x + 5y = 6 b. < 1/2 - 3/4y = 0 < 2/3 + 1 1/4y = 9 c. < 3x + 4y = 1 2/3 < 6x + 3y = 1 1/4 PILNIE!!

a. < 1/2x - 2y = 8 < 2x + 5y = 6 1/2x= 8-2y /×2 x= 16-4y 2(16-4y)+5y=6 32-8+5y=6 -3y=-26 y=26/3 y= 8 2/3 1/2x+2y =8 1/2x+2×(26/3)=8 1/2x+52/3=8 1/2x= -52/3+24/3 1/2x= -28/3 /×2 x=-56/3 x=-18 2/3