October 2018 1 13 Report

13. Są to układy równań ( w klamerce)

-x-3y=15

y= -2x

14.

2x-4y=18

y=5x

15.

3x + 6y =12

x= -3y 1

6.

x+y=3

x=y=1

17.

2x + y = 1

-x - y = 2

18.

-3x + 2y = 1

x-y=3

19. x+y=9

x-y=3

20.

x+y = 9

x-y=0

21.

y-x=-7

x+y = 13

22.

2x+y=3

x+y=1


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