x+2 -------- - 2y =5 5 y+2 x - -------- =3 6 _______________________ x+2 - 10y =25 6x - y-2 =18 _______________________ x - 10y =23 6x - y =20 _______________________ x - 10y =23 -60x + 10y =-200 _______________________ -59x=-177 _______________________ x=3 _______________________ x - 10y =23 _______________________ 3-10y=23 _______________________ -10y=20 _______________________ y=-2
x+2 -------- - 2y =5 /*5 5 y+2 x - -------- =3/*6 6 x + 2 - 10y = 25 6x - y - 2 = 18 Metoda przeciwnych współczynników x - 10y = 23 6x - y =20 / * (-10) x - 10y = 23 -60x + 10y = -200 -59x = -177 /:(-59) x = 3 Podstawiamy wiadomą x do równania I x - 10y = 23 3 - 10y = 23 -10y = 20 /:(-10) y = -2 Odp. X = 3, y = -2
(x+2)/5 - 2y=5 /*5 x- (y+2)/6=3 /*6 x+2-10y=25 6x-(y+2)=18 x-10y=25-2 6x-y-2=18 x-10y=23 6x-y=20 /*(-10) x-10y=23 -60x+10y=-200 ------------------- -59x=-177 /:(-59) x=3 6x-y=20 6*3 -y=20 18-y=20 -y=20-18 -y=2 y=-2