Rozwiaz algebraicznie uklad rownan: a) {x-3y=4 {x-y=8 b) {y=4-2x {x-y= -1 c) {2x-y-1=0 {x=1/2(y+1) d) {x+2/3 + y/6=1 {x-2/4-y/4=0.5

a) {x-3y=4 {x-y=8 {x=4+3y 4+3y=8 3y=8-4 3y=4/3 y=4/3 x=4+3y x=4+3*4/3 x=4+4 x=8 b) {y=4-2x {x-y= -1 x-4-2x=-1 -x=-1+4 -x=3/(-1) x=-3 y=4-2x y=4-2*(-3) y=4+6 y=10 c) {2x-y-1=0 {x=1/2(y+1) 2*(1/2(y+1))-y-1=0 2*(1/2y+1/2)-y-1=0 y+1-y-1=0 0=0 - równanie sprzeczne d) {x+2/3 + y/6=1 {x-2/4-y/4=0.5/*4 {x=1-2/3-y/6 {x-2-y=2 1-2/3-y/6-2-y=2/*6 6-4-y-2-y=12 -2y=12/(-2) y=-6 x-2-y=2 x-2+6=2 x=-2