Question

1.Oblicz.

1) 6x=24

x+2y=8

2) 6x+2y=6

8x-2y=8

3) x+2y=9

-x-3y=16

Answer 1

zad.1

6x= 24 //:6

x= 4

 

4+2y= 8

2y= 4

y= 2

 

zad.2

  6x+2y=6

+ 8x-2y=8     

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

14x= 14

x= 1

6+2y=8

y= 1

zad.3

  x+2y=9

-x-3y=16

 

x= 9-2y

-(9-2y)-3y= 16

-9+2y-3y= 16

-y= 25

y= -25

x-50= 9

x= 59

 

 

 

 

Answer 2

1) 6x = 24 / : 6

x + 2y = 8

 

x = 4

4+ 2y = 8

 

x= 4

2y = 4

 

y=2

 

2)

 

6x + 2y =6

8x-2y=8

 

14x = 14

x=1

 

6+2y = 6

2y=0

 

y=0

x=1

 

3) 

x+2y=9

-x-3y=16

 

-y= 25

y=-25

 

x+ 2*(-25) =9

x= 9 + 50

x=59