rozwiąż układ równan metodą podstawiania a)1/2x-2y=8 2x+5y=6

1/2x - 2y = 8 | *2 2x+5y = 6 x - 4y = 16 2x+5y= 6 x= 16 + 4y 2*(16+4y) = 6 x= 16 + 4y 32+ 8y= 6 x= 16+4y 8y= 6- 32 x= 16 +4y 8y= -26|:8 x= 16 +4y y= 3,25 x= 16+ 4 * 3,25 x= 13 y=3,25

(1/2)*x -2y = 8 2x + 5y = 6 ------------------- Z I) mamy 2y = (1/2)x - 8 y = (1/4)x - 4 2x + 5*[ (1/4)x - 4] = 6 2x + (5/4)*x - 20 = 6 (8/4)*x +(5/4)*x = 26 (13/4 )*x =26 13x = 104 x =104 /13 = 8 y = (1/4)*8 - 4 =2 - 4 = -2 Odp. x = 8 oraz y = -2

1/2x-2y=8/*2 2x+5y=6 x-4y=16 2x+5y=6 x= 16+4y 2(16+4y)+5y=6 x=16+4y 32+8y+5y =6 x=16+4y 13y=-26 x=16+4y y=-2 x=16+4*-2 y=-2 x=8 y=-2