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Olechka2865
@Olechka2865
July 2022
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Помогите пожалуйста!Решите способом сложения и способом подстановки систему:
2х-у=0,
3х-2у=-2;
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Answers & Comments
MarthaMaslo
Способ подстановки:
-у=-2х => y=2x => 3x-2*2x=-2 => 3x-4x=-2 => 7x=-2 => x= -2/7 => y=-2*(-2/7) => y=4/7
Способ сложения:
2x-y=0 | *(-2) => -4x+2y=0
-4x+2y=0
+
3x-2y=-2
-------------
-x=-2 => x=2 => 3*2-2y=-2 => 6-2y=-2 => -2y=-2-6 => y=-8/-2 => y=4
2 votes
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Answers & Comments
-у=-2х => y=2x => 3x-2*2x=-2 => 3x-4x=-2 => 7x=-2 => x= -2/7 => y=-2*(-2/7) => y=4/7
Способ сложения:
2x-y=0 | *(-2) => -4x+2y=0
-4x+2y=0
+
3x-2y=-2
-------------
-x=-2 => x=2 => 3*2-2y=-2 => 6-2y=-2 => -2y=-2-6 => y=-8/-2 => y=4