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DilermandoFideles123
@DilermandoFideles123
November 2019
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3- Resolva os sistemas de equações pelo método de adição:
Me ajudem por favor!!
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TheGenious
Olá,
a)
x-y=1
x+y=9
x-y=1
+ x+y=9
-------------
2x = 10
x = 10/2
x = 5
5-y = 1
-y = 1-5
-y = -4 (-1)
y = 4
S={5;4}
b)
x+3y=5 (-2) (5)
2x-y=4
-2x-6y = -10
+ 2x-y = 4
--------------------
-7y = -6
y = -6/-7
y = 6/7
-2x-6(6/7) = -10
-2x-36/7 = -10
-2x = 10/36/7
x = 17/7
S={17/7;6/7}
c)
2x-3y = -12
5x+3y = -9
2x-3y = -12
+ 5x+3y = -9
---------------------
7x = -21
x = -21/7
x = -3
2(-3)-3y = -12
-6-3y = -12
-3y = -12+6
-3y = -6
y = -6/-3
y = 2
S={-3;2}
Espero ter te ajudado!
1 votes
Thanks 1
DilermandoFideles123
Obrigado
TheGenious
De nada! ;-)
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Lista de comentários
a)
x-y=1
x+y=9
x-y=1
+ x+y=9
-------------
2x = 10
x = 10/2
x = 5
5-y = 1
-y = 1-5
-y = -4 (-1)
y = 4
S={5;4}
b)
x+3y=5 (-2) (5)
2x-y=4
-2x-6y = -10
+ 2x-y = 4
--------------------
-7y = -6
y = -6/-7
y = 6/7
-2x-6(6/7) = -10
-2x-36/7 = -10
-2x = 10/36/7
x = 17/7
S={17/7;6/7}
c)
2x-3y = -12
5x+3y = -9
2x-3y = -12
+ 5x+3y = -9
---------------------
7x = -21
x = -21/7
x = -3
2(-3)-3y = -12
-6-3y = -12
-3y = -12+6
-3y = -6
y = -6/-3
y = 2
S={-3;2}
Espero ter te ajudado!