Danny56592
Danny56592
16-02-2015
Mathematics
contestada
6x+7y=20
Y=2x
How do u solve this one ¿
Respuesta :
serdaryilmaz
serdaryilmaz
16-02-2015
if y=2x
7y=14x .
6x+14x=20
20x=20
x being 1 x=1
we found x .
and putting in this problem.
y=2x
y will be 2 , y=2
i am so sorry for my bad english :(
Answer Link
konrad509
konrad509
16-02-2015
[tex]6x+7y=20\\ y=2x\\\\ 6x+7\cdot2x=20\\ 6x+14x=20\\ 20x=20\\\\ x=1\\\\ y=2\cdot1\\ y=2\\\\ \boxed{(x,y)=(1,2)} [/tex]
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