Rozwiąz układ równań metoda podstawiania i sprawdz,czy wyznaczona para licz spelnia ten uklad (Podr.Matematyka 2001 klasa 2 str.221 zad 4c w starych podrecznikach, w nowych 2 strony dalej) Dam NAJ ! c) {x+y=8 {x-y=8

[latex]c)\egin{cases}x+y=8 \ x-y=8 end{cases}\\egin{cases}x=-y+8 \ -y+8-y=8 end{cases}\\egin{cases}x=-y+8 \ -2y =8-8 end{cases}\\egin{cases}x=-y+8 \ -2y=0 end{cases}\\egin{cases}x=-0+8 \ y=0 end{cases}\\egin{cases}x= 8 \ y=0 end{cases}[/latex] [latex]spr.\egin{cases}8+0=8 \ 8-0=8 end{cases}\\ egin{cases}8 =8 \ 8 =8 end{cases}\\ L=P[/latex]

[latex] left { {{x+y=8} atop {x-y=8}} ight. \\ left { {{x=8-y} atop {x-y=8}} ight. \\ left { {{x=8-y} atop {8-y-y=8}} ight. \\ left { {{x=8-y} atop {8-2y=8}} ight. \\ -2y=0\ y=0\ x+y=8\ x+0=8\ x=8\ left { {{x=8} atop {y=0}} ight. [/latex]