Odpowiedzi

2009-12-14T17:41:24+01:00
Witam laska!
rozwiaz uklad rownan dowolna metoda ;

3(x-y)+4x=8
3(x-5y)=5-9y


3x-3y+4x=8
7x-3y=8/7
x-3y= 8/7/-3
x-y=8/21

3x-15y=5-9y
3x-15y+9y=5
3x-6y=5/3
x-6y=5/3/-6
x-y=5/18
Pzdr.
2009-12-14T17:41:59+01:00
3(x-y)+4x=8
3(x-5y)=5-9y

3x-3y+4x=8
3x-15y=5-9y

7x-4y=8
3x-15y+9y=5

7x-4y=8 /*(-3)
3x-6y=5 /*2

-21x+12y=-24
6x-12y=10

-15x=-14 /:(-15)
x=14/15

3x-3y+4x=8
3*14/15-3y+4*14/15=8
42/15 -3y +56/15=8
-3y=8-98/15
-3x=8-6 8/15
-3x=1 7/15 /:(-3)
x=22/15 * (-1/3)
x=-22/45

Pozdrawiam:)