Предмет: Математика, автор: anankoanastasia22982

Помогите пожалуйста решить систему уравнений
28х+44у = 44
х+у = 1,25

С объяснением умоляю

Ответы

Автор ответа: iramazurk
1

Ответ:

(0,6875; 0,5625)

Пошаговое объяснение:

Решим систему методом подстановки:

{28х + 44у = 44

{х + у = 1,25


{28х + 44у = 44

{х = 1,25 - у


1)

28х + 44у = 44

28(1,25 - у) + 44у = 44

35 - 28у + 44у = 44

-28у + 44у = 44 - 35

16у = 9

у = 9 : 16

у = 0,5625


2)

х = 1,25 - у

х = 1,25 - 0,5625

х = 0,6875

Автор ответа: Пеппер
0

28х+44у = 44

х  +  у  = 1,25;

Решаем способом подстановки:

х=1,25-у

28(1,25-у)+44у=44

х=1,25-у

35-28у+44у=44

х=1,25-у

16у=9;  у=9/16

х=1,25-у=1 1/4 - у = 5/4 - у = 5/4 - 9/16 = 20/16 - 9/15 = 11/16

Ответ: (11/16;  9/16)

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