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slava20038
@slava20038
July 2022
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Помогите ! Алгебра 7 класс , Решение системных уравнений ...
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Flash3146
X+y=7
y=7-x
x=7-y
x+3y=0
3y=-x|:3
y=-1/3x
x=-3y
2x+5y=-10
2x=-10-5y|:2
x=-5-2,5y
5y=-10-2x|:5
y=-2-0,4x
-3x-8y=2,4
-3X=2,4+8Y|:(-3)
X=-0,8-8/3Y
-8Y=2,4+3X|:(-8)
Y=-0,3-0,375X
2x-3y=9
2x=9+3y|:2
x=4,5+1,5y
-3y=9-2x|:(-3)
y=-3+2/3x
надеюсь,ты понял
1 votes
Thanks 1
slava20038
надо все варианты
Flash3146
попробуй сам,я устала
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Answers & Comments
y=7-x
x=7-y
x+3y=0
3y=-x|:3
y=-1/3x
x=-3y
2x+5y=-10
2x=-10-5y|:2
x=-5-2,5y
5y=-10-2x|:5
y=-2-0,4x
-3x-8y=2,4
-3X=2,4+8Y|:(-3)
X=-0,8-8/3Y
-8Y=2,4+3X|:(-8)
Y=-0,3-0,375X
2x-3y=9
2x=9+3y|:2
x=4,5+1,5y
-3y=9-2x|:(-3)
y=-3+2/3x
надеюсь,ты понял