Question

Ukłąd równań

x+2/5 -2y=5

x- y+2/6 =3

Answer 1

 

[x+2/5 -2y=5    /*5

[x- y+2/6 =3     /*6

 

[5x+2-10y=25

[6x-6y+2=18

 

[5x-10y=23   /*6

[6x-6y=16     /*(-10)

 

[30x-60y=138

[-60x+60y=-160                 +

----------------------------------

-30x=-22 /:-30

x=11/15

6* 11/15 -6y=16

-6y=16- 4 i 2/5

-6y=11 i 3/5     /:-6

y=29/15

y=1 i 14/15

 

[x=11/15

[y=1 i 14/15