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murillo1601
@murillo1601
August 2022
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gnomiha211
1)
---------------------
3x+4y=-7 \*3
5x+6y= -11 \*(-2)
-----------------------
9x+12y= -21
-10x- 12y= 22
-----------------------
(метод сложения +12y и -12y)
-x= 1
3x+4y=-7
----------------------
x=-1
-3+4y=-7
----------------------
x=-1
4y= -4
--------------------
x=-1
y=-1
---------------------
(-1;-1)
2)
---------------------
8x=9y
6x-5y=14
--------------------
8x-9y=0 \*(-5)
6x-5y=14 \*9
---------------------
-40x+45y=0
54x-45y=126
-----------------------
(метод сложения +45y и -45y)
14x= 126
8x=9y
-----------------------
x=9
72= 9y
---------------------
x=9
y=8
-----------------------
(9;8)
Ответы: (-1;-1) и (9;8)
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Answers & Comments
---------------------
3x+4y=-7 \*3
5x+6y= -11 \*(-2)
-----------------------
9x+12y= -21
-10x- 12y= 22
-----------------------
(метод сложения +12y и -12y)
-x= 1
3x+4y=-7
----------------------
x=-1
-3+4y=-7
----------------------
x=-1
4y= -4
--------------------
x=-1
y=-1
---------------------
(-1;-1)
2)
---------------------
8x=9y
6x-5y=14
--------------------
8x-9y=0 \*(-5)
6x-5y=14 \*9
---------------------
-40x+45y=0
54x-45y=126
-----------------------
(метод сложения +45y и -45y)
14x= 126
8x=9y
-----------------------
x=9
72= 9y
---------------------
x=9
y=8
-----------------------
(9;8)
Ответы: (-1;-1) и (9;8)