12x + 6y = 60 x + y = 7 to jest ukł. równań

12x + 6y = 60 x + y = 7 y=7-x 12x+6(7-x)=60 12x+42-6x=60 6x=18 x=3 y=7-3 y=4

12x+6y=60 x=7-y 12*(7-y)+6y=60 x=7-y 84-12y+6y=60 x=7-y -12y+6y=60-84 x=7-y -6y=-24/:(-6) x=7-y y=4 x=7-y y=4 x=3