Решите систему уравнений методом сложения. 1)x+y=11 2x-y=-5 2) 2x+y=5 3x-2y=4

X+y=11  2x-y=-5складываем их3х=6х=22x+y=5 умножаем на 2 и складываем 1и2 уравнения 3x-2y=4 7х=14 х=2

2мешок        80-3х=х                  1 мешок 60-х=2х                       х=80-3х                                  2х=60-х                       х+3х=80                                2х+х=60                       4х=80                                      3х=6                                                        х=20 *3=60(взяли из мешка)                    х=20(взяли из мешка) 80-60=20                                        60-20=40(в 2 раза больше чем во втором) ответ: в первом мешке осталось 40 кг

Dear robert, my son and i are thrilled at your kind offer to have us as visitors any time in the summer. do you think we could possibly visit you on a sporting trip to britain in the later part of june? what i mean by «sporting trip» is that we should not like to cause too much inconvenience and should be grateful for any camp-bed arrangement. my husband wishes me to give you his regards and to thank you for extending your invitation to him as well. it is very kind of you indeed. he is very sorry he does not feel up to any trip yet. he will write to you himself. many thanks and best regards to you all from all of us here. yours ,