Rozwiąż układ równań metodą podstawiania ;D a) {x=y-1 {y+2x-13 b) {x=y+1 {2x-y+2=0 Dam naj ;D

a) {x=y-1 {y+2x=13 x=y-1 y+2(y-1)=13 x=y-1 y+2y-2=13 x=y-1 3y=13+2 x=y-1 3y=15 |:3 x=y-1 y=5 x=5-1 y=5 x=4 y=5 b) {x=y+1 {2x-y+2=0 x=y+1 2(y+1)-y+2=0 x=y+1 2y+2-y+2=0 x=y+1 y=-4 x=-4+1 y=-4 x=-3 y=-4

x=y-1 y+2x-13 x=y-1 y+2(y-1)=13 x=y-1 y+2y-2=13________/+2 x=y-1 3y=15________/:3 x=y-1 y=5 x=5-1 y=5 x=4 y=5 x=y+1 2x-y+2=0 x=y+1 2(y+1)-y+2=0________/-2 x=y+1 2y+2-y=-2_______/-2 x=y+1 y=-4 x=-4+1 y=-4 x=-3 y=-4

a) {x=y-1 {y+2x-13 {x=y-1 {y+2(y-1)=13 {x=y-1 {y+2y-2=13 {x=y-1 {3y=15/3 {x=y-1 {y=5 {x=5-1 {y=5 {x=4 {y=5 b)b {x=y+1 {2x-y+2=0 {x=y+1 {2(y+1)-y+2=0 {x=y+1 {2y+2-y+2=0 {x=y+1 y=-4 x=-4+1 y=-4 x=-3 y=-4