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issagirl05
20.11.2019 •
Mathematics
What is the solution to this system of linear equations?
2x + y = 1
3x – y = –6
(–1, 3)
(1, –1)
(2, 3)
(5, 0)
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Ответ:
3 x - y = -6 * ( 2 )
- 6 x - 3 y = - 3
6 x - 2 y = - 12
- 5 y = - 15 * ( - 1 )
5 y = 15
y = 15 / 5
y => 3
For x :
2 x + y = 1
2 x + 3 = 1
2 x = 1 - 3
2 x = - 2
x = - 2 / 2
x => - 1
Solution ( - 1 and 3 )
Answer A
hope this helps!
Ответ: