a) 3x+2x=10 5x=10/:5 x=2 b)-x-3(-2x)=5 -x+6x=5 5x=5/:5 x=1 c) x+y=7 x=y+1 y+1+y=7 2y=6/:2 y=3 x=3+1=4 d) 2x-y=4 x=11-y 2(11-y)-y=4 22-2y-y=4 -3y=-18/:(-3) y=6 x=11-6=5 e)x-2y=3 2x=3y+8 x=2y+3 2(2y+3)=3y+8 4y+6=3y+8 y=2 x=2*2+3=7
a) 3x+y=10 y=2x y=10-3x 10-3x=2x -5x=-10 /:(-5) y=10-3x x=2 y=10-3*2 x=2 y=4 b) -x-3y=5 y=-2x -x=5+3y /*(-1) y=-2x x=-5-3y y=-2(-5-3y) y=10+6y x=-5-3y -5y=10 /:(-5) x=-5-3y y=-2 x=-5-3*(-2) x=-5+6 y=-2 x=1 y=-2 c) x+y=7 x-y=1 x=7-y 7-y-y=1 -2y=1-7 x=7-y -2y=-6 /:(-2) x=7-y y=3 x=7-3 x=4 y=3 d) 2x-y=4 x+y=11 -y=4-2x /*(-1) x+y=11 y=-4+2x x-4+2x=11 3x=11+4 y=-4+2x 3x=15 /:3 y=-4+2x x=5 y=-4 +2*5 x=5 y=-4+10 x=5 y=6 Ps. e nie umie sorki
a) 3x+y=10 y=2x 3x+2x=10 5x=10 /:5 x=2 bo 5x=10 5*2= 10 b) -x-3y=5 /+x y= -2x -3y=5+x -3(-2x)=5=x 6x=5+x /-x 5x=5 x=1 y= -2 bo -1+6=5 c) x+y=7 x-y=1 / +y x+y=7 x=1+y 1+y+y=7 /-1 2y=6 y=3 x=4 bo 4-3=1 d) 2x-y=4 x+y=11 /-y 2x-y=4 x=11-y 2(11-y)-y=4 22-3y=4 /-22 -3y=-18 3y=18 y=6 x=5 bo 10-6=4 e) x-2y=3 2x=3y+8 x=2y+3 2(2y+3)=3y+8 4y+6=3y+8 y=2 x=2*2+3= 7 ostatniego pewna nie jestam ale raczej dobrze;]
