{3x-y=11 {x+2y=6 x=6-2y 3(6-2y)-y=11 18-6y-y=11 -7y=11-18 -7y=-7 /:(-7) y=7 x= 6-2*7= 6-14 = -8 {x= -8 {y= 7 {3x+2y=18 {x-y=1 x=y+1 3(y+1)+2y=18 3y+3+2y=18 5y=18-3 5y=15/:5 y=3 x=3+1=4 {x= 3 {y = 4 {2x-y=4 {x+y=5 x=5-y 2(5-y)-y=4 10-2y-y=4 -3y=4-10 -3y=-6 /:(-3) y= 2 x=5-2 =3 {x = 3 {y= 2 {4x+3y= 9 {2x-7y=13 4x=9-3y /:4 x= 9-3y/4 2*9-3y/4-7y=13 9-3y/2 - 7y = 13 /*2 9-3y-14y=26 -17y=26-9 -17y=17 /:(-17) y = -1 x= 9-3*(-1) / 4 = 9+3 / 4 = 12/4 = 3 {x=3 {y= -1 {0,25x+3y= 7 {0,5x+6y=14 3y=7-0,25x /:3 y= 7-0,25x /3 0,5x+6*7-0,25x/3= 14 0,5x+2(7-0,25x)=14 0,5x+14-0,5x=14 14=14 to równanie nie ma rozwiązania
3x-y=11 /*2 x+2y=6 6x-2y=22 x+2y=6 7x=28 /:7 x=4 3x+2y=18 x-y=1/*2 3x+2y=18 2x-2y=2 5x=20/:5 x=4 2x-y=4 x+y=5 3x=9/:3 x=3 4x+3y=9/*7 2x-7y=13/*3 28x+21y=63 4x-21y=39 32x=102/:32 x=3,6/102 0,25x+3y=7/*(-4) 0,5x+6y=14/*2 x-12y=(-28) x+12y=28 2x=0/:2 x=0 Proszę ;)
