a) x=-y x-y=6 x=-y x-y-y=6 x=-y x-2y=6/:(-2) x=-y x/2+y=3 b) y=x+3 2x+y=9 y=x+3 2x+x+3=9 y=x+3 3x=9-3 y=x+3 3x=6/:3 y=x+3 x=2 x=2 y=2+3=5 c) x-4y=15 y=4x y=4x x-4*(4x)=15 y=4x x-16x=15 y=4x -15x=15/:(-15) y=4x x=-1 x=-1 y=4 d) y=-2x-1 x=y+7 x=y+7 y=-2*(y+7)-1 x=y+7 y=-2y-14-1 x=y+7 y+2y=-15 x=y+7 3y=-15/:3 y=-5 x=-5+7 y=-5 x=2 e) -3x=2y y=1-x y=1-x -3x=2*(1-x) y=1-x -3x=2-2x y=1-x -3x+2x=2 y=1-x -x=2/*(-1) x=-2 y=1-2 x=-2 y=-1
a) x=-y x-y=6 x=-y -y-y=6 x=-y -2y=6 / :-2 x=-y y=-3 x=-(-3)= 3 b) y=x+3 2x+y=9 y=x+3 2x+x+3=9 y=x+3 3x+3=9 y=x+3 3x=9-3 y=x+3 3x=6 /:3 y=x+3 x=2 y=2+3=5 c) x-4y=15 y=4x x-4(4x)=15 y=4x x-16x=15 y=4x -15x=15 y=4x x=-1 y=4*(-1)=-4 d) y=-2x-1 x=y+7 y+2x=-1 x=y+7 y+2(y+7)= -1 x=y+7 y+2y+14= -1 x=y+7 3y= -14-1 x=y+7 3y= -15 / :3 x=y+7 y=-5 x= -5-7=2 e) -3x=2y y=1-x -3x-2y=0 y=1-x -3x-2(1-x)=0 y=1-x -3x-2+2x=0 y=1-x -x=2 y=1-x x=-2 y=1-2=-1 f) 5x+6x=8 x=4y-1 -----> ten przyklad raczej zle jest napisany
a) x= -y x - y =6 x= -y -y -y =6 x= -y -2y= 6/:(-2) x= -y y= -3 x= 3 y= -3 b) y=x+3 2x+y=9 y=x+3 2x+x+3=9 y=x+3 3x=6/:3 y=x+3 x=2 y=2+3 x=2 y=5 c) x-4y=15 y=4x x-16x=15 y=4x -15x=15/:(-1) y=4x x=-1 y=4*(-1) x=-1 y=-4 d) y=-2x-1 x=y+7 y=-2x-1 x=-2x-1+7 y=-2x-1 3x=6/:3 y=-2x-1 x=2 y=-5 e) -3x=2y y=1-x -3x=2(1-x) y=1-x -3x=2-2x y=1-x -x=2/:(-1) y=1-x x=-2 y=1+2 x=-2 y=3
