a) x+y=5 x-2y=-1 x=5-y 5-y-2y=-1 -3y=-6 y=2 x=5-2=3 b) y-x=4 3(x+y)=24 y=4+x 3(x+4+x)=24 6x+12=24 6x=12 x=2 y=4+2=6 c) x-2y=4 x+3=2y to mi jakoś nie wychodzi d) 3x-1=y-2 4x-3=2(y-2) 4x-3=6x-2 -2x=1 x=-1/2 -2-3=2y-4 2y=-1 y=-1/2 e) 2(x+y)-(x-1)=y+2 x+y=1 2-(x-1)=y+2 y=1-x -2x-2-x+1=1-x+2 -2x=4 x=-2 y=1+2=3
a) x+y=5 x-2y=-1 x=5-y 5-y-2y=-1 x=5-y -3y=-1-5 x=5-y -3y=-6 /:-3 x=5-y y=2 x=5-2 y=2 x=3 y=2 b) y-x=4 3(x+y)=24 y=4+x 3x+3y=24 y=4+x 3x+3(4+x)=24 y=4+x 3x+12+3x=24 y=4+x 6x=24-12 y=4+x 6x=12 /:6 y=4+x x=2 y=4+2 x=2 y=6 x=2 d) 3x-1=y-2 4x-3=2(y-2) y=1+3x 4x-3=2y-4 y=1+3x 4x-3=2(1+3x)+3x y=1+3x 4x-3=2+6x+3x y=1+3x 4x-6x-3x=2+3 y=1+3x -5x=5 /:-5 y=1+3x x=-1 y=1+3*(-1) x=-1 y=1-3 x=-1 y=-2 x=-1 e) 2(x+y)-(x-1)=y+2 x+y=1 2x+2y-x+1=y+2 x=1-y x+y=2-1 x=1-y 1-y+y=2-1 x=1-y o=0 x=1-0 x=1
