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katerinalobanova
@katerinalobanova
July 2022
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ПОМОГИТЕЕ СРОЧНОО ПОЖАЛУЙСТА
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Avery2712
1. x+y=7, | ×7
5x-7y=11;
7x+7y=49,
5x-7y=11;
7x+5x=60,
12x=60;
x=5.
1) 5+y=7
y=2
Ответ: (х,у)=(5,2)
2. x+y=5,
xy=-14:
x=5-y
(5-y)y=-14
y=7
y=-2
x=-2
x=7
Ответ: (x¹,y¹)=(-2,7)
(x²,y²)=(7,-2)
3. x-y=6, |×-1
x²+y²=20, |×-1
x=6+y
x²-y²=20
(6+y)²-y²=20
y= -4/3
x=6-4/3
x=14/3
Ответ: (х,у)=(14/3,-4/3)
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Answers & Comments
5x-7y=11;
7x+7y=49,
5x-7y=11;
7x+5x=60,
12x=60;
x=5.
1) 5+y=7
y=2
Ответ: (х,у)=(5,2)
2. x+y=5,
xy=-14:
x=5-y
(5-y)y=-14
y=7
y=-2
x=-2
x=7
Ответ: (x¹,y¹)=(-2,7)
(x²,y²)=(7,-2)
3. x-y=6, |×-1
x²+y²=20, |×-1
x=6+y
x²-y²=20
(6+y)²-y²=20
y= -4/3
x=6-4/3
x=14/3
Ответ: (х,у)=(14/3,-4/3)