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ElizabettSnow
@ElizabettSnow
August 2022
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ермак, алгебра, 9 класс
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mmb1
Verified answer
2x+7y=5
3|x|+y=4
второе умножаем на 7 и вычитаем первое
21|x| + 7y - 2x - 7y = 28 - 5
21|x| - 2x = 23
1. x>=0
21x - 2x=23
x=23/19
y = ( 5 - 46/19) / 7 = (95/19 - 46/19) / 7 = 49 /19 * 1/7=7/19
2. x<0
-21x- 2x=23
x=-1
-2 + 7y=5
7y=7
y=1
Ответ ( -1 1) (23/19 7/19)
1 votes
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Answers & Comments
Verified answer
2x+7y=53|x|+y=4
второе умножаем на 7 и вычитаем первое
21|x| + 7y - 2x - 7y = 28 - 5
21|x| - 2x = 23
1. x>=0
21x - 2x=23
x=23/19
y = ( 5 - 46/19) / 7 = (95/19 - 46/19) / 7 = 49 /19 * 1/7=7/19
2. x<0
-21x- 2x=23
x=-1
-2 + 7y=5
7y=7
y=1
Ответ ( -1 1) (23/19 7/19)