Question

ROZWIĄŻ UKŁADY RÓWNAŃ:

1.x+3y=3

x-y=5

2.2x-y=10

x+5y=-17

PROSZE TO NA JUTRO!!!!!!

Answer 1

1.

x+3y=3

x-y=5

 

x=3-3y

3-3y-y=5

 

x=3-3y

-3y-y=5-3

 

x=3-3y

-4y=2 /:(-4)

 

x=3-3y

y=- ½

 

x=3-3 * (-½)

y=-½

 

x=3+1½

y=-½

 

x=4½

y=-½

 

 

2.

2x-y=10

x+5y=-17

 

2x-y=10

x=-17-5y

 

2*(-17-5y)-y=10

x=-17-5y

 

-34-10y-y=10

x=-17-5y

 

-10y-y=10+34

x=-17-5y

 

-11y=44 /:(-11)

x=-17-5y

 

y=-4

x=-17-5*(-4)

 

y=-4

x=-17+20

 

y=-4

x=3

Answer 2

x+3y=3

x-y=5

 

x=3-3y

3-3y-y=5

-4y=5+3

-4y=8  /-4

y=2

 

x+3*2=3

x+6=3

x=3-6

x=-3

 

spr.x+3y=3

-3+3*2=3

-3+6=3

3=3

 

2x-y=10

x+5=-17

 

 

x=-17-5

x=-22

2*-22-y=10

-44-y=10

-y=10+44

-y=54  /*-1

y=-54

 

spr.2x-y=10

podstawiamy

2*-22-(-54)=10

-44+54=10

10=10