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AndrielyGodoi
@AndrielyGodoi
April 2020
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Num quintal existem perus e coelhos, somando ao todo 30 cabeças e 86 pés. quantos sao os perus e quantos os coelhos.
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ittalo25
Verified answer
X = peru
y = coelho
x + y = 30 .(-2)
2x + 4y = 86
--------
-2x -2y = -60
2x + 4y = 86
------
soma
-------
2y = 26
y = 13
------
x+y = 30
x + 13 = 30
x = 17
2 votes
Thanks 2
GabrielAw9
x= perus
y= coelhos
x+y=30 -2
2x+4y=86
-2x-2y=-60
2x+4y=86
2y=26
y=26/2
y=13
x+y=30
x+13=30
x=30-13
x=17
2 votes
Thanks 1
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Verified answer
X = peruy = coelho
x + y = 30 .(-2)
2x + 4y = 86
--------
-2x -2y = -60
2x + 4y = 86
------
soma
-------
2y = 26
y = 13
------
x+y = 30
x + 13 = 30
x = 17
y= coelhos
x+y=30 -2
2x+4y=86
-2x-2y=-60
2x+4y=86
2y=26
y=26/2
y=13
x+y=30
x+13=30
x=30-13
x=17