Система рівнянь

2х-3у=-4

3х+2у=7

Помогите пожалуйста с тестом, от него зависит моя четвертная оценка* Очень хочу чтобы вышла 4.. А эту тему вообще не понимаю(

Тест на тему "Страдательный залог"

11. When we arrived at the airport, we found that the flight ___. 
A had been cancelled 
B is being cancelled 
C has been cancelled 

12. The flowers in the flowerbeds ___ by this evening. 
A are being watered 
B were watered 
C will have been watered 

13. America ___ several centuries ago. 
A had been discovered 
B was discovered 
C will be discovered 

14. The floors in the office ___ every day. 
A are swept 
B will have been swept 
C were being swept 

15. An old woman ___ while she was living with her children. 
A is being looked after 
B was being looked after 
C will be looked after 

16. I think the money ___ back in the nearest future. 
A had been paid 
B were paid 
C will be paid 

17. My car ___ at the moment. 
A was being repaired 
B has been repaired 
C is being repaired 

18. The exams ___ by 3 in the afternoon. 
A will have been finished 
B were being finished 
C are being finished 

19. Olympic Games ___ every four years. 
A are held 
B had been held 
C will have been held 

20. When we returned home, the walls ___. 
A has been painted 
B had been painted 
C will be painted

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