При каком значении а корень уравнения ах+ 5=-8 равен -2? (Вспомни определение корня уравнения)

1 предложение уже в Present Simple
2 She prepared breakfast yesterday.
3 She will prepare breakfast tomorrow morning
4 She is preparing breakfast now.
5 She was preparing breakfast yesterday at that time.
6. She will be preparing breakfast tomorrow at this time.
7 She HAS already PREPARED breakfast
8 She HAD PREPARED breakfast by 7 a.m yesterday
9 She will have prepared breakfast by 7 a.m. tomorrow
10 She had been preparing breakfast for 10 minutes already by that time yesterday.
11 She will have been preparing breakfast for 15 minutes by this time tomorrow.
 

British must stay at school from the age of 5 until they are 16.Many of them stay longer and take final exams when they are 17 or 18. Children spend 6 years in elementary school, and 4 or 6 years in secondary or high school. School education is free. At the end of every school year, the children take a test. If a child does good, he goes into next class .  At the end of their time at school, most students get a high school diploma. If they want to on to college, they take college admission tests. In Britain, there are state schools, which are also free, and private schools for which parent’s pay . The children stay at school all the time, and only come home in some holidays. Actually , British wear school uniform. It's one of the oldest country's traditions. A boy's uniform includes a cap, a tie and a blazer. A girl's uniform incluses a hat , a skirt , a coat and a blouse. And  the uniforms for boys and girls are usually dark.