Układy równań z dwiema niewiadomymi. Potrzebuje pomocy w tej magii. Kompletnie nie rozumiem jak to zrobić A. x-(y-x)= -2 3x-(x-y)=6 B. x-(3-y)=2 4x-(y-6)=11 C. x+4y=-1 x-6y=-6 D. 3x+y=-2 6x-5y=3 E. 3x-y=0 3x+2y=9

A. x-(y-x)= -2 3x-(x-y)=6 x-y+x=-2 3x-x+y=6 2x-y=-2/+y 2x+y=6 2x=y-2/+2 2x+y=6 y=2x+2 2x+y=6 y=2x+2 2x+2x+2=6/-2 y=2x+2 4x=4/:4 y=2x+2 x=1 y=2·1+2 x=1 x=1 y=4 B. x-(3-y)=2 4x-(y-6)=11 x-3+y=2/+3 4x-y+6=11/-6 x+y=5/-y 4x-y=5 x=5-y 4(5-y)-y=5 x=5-y 20-4y-y=5/+5y x=5-y 20=5y+5/-5 x=5-y 5y=15/:5 x=5-y y=3 x=2 y=3 C. x+4y=-1 x-6y=-6/+6y x+4y=-1 x=6y-6 6y-6+4y=-1/=6 x=6y-6 10y=5/:10 x=6y-6 y=0,5 x=6·0,5-6 y=0,5 x=-3 D. 3x+y=-2/-3x 6x-5y=3 y=-2-3x 6x-5y=3 y=-2-3x 6x-5(-2-3x)=3 y=-2-3x 6x+10+15x=3/-10 y=-2-3x 21x=-7/:21 y=-2-3x x=-1/3 y=-2-3·-1/3 x=-1/3 y=-2+1 x=1/3 y=-1 x=1/3 E. 3x-y=0/+y 3x+2y=9 y=3x 3x+2y=9 y=3x 3x+2·3x=9 y=3x 3x+6x=9 y=3x 9x=9/:9 y=3x x=1 y=3·1 x=1 y=3 x=1