anonymous
  • anonymous
solve the system of equations y=2x-10 and x-y=7
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
By substituion: put y=2x-10 in x-y=7 x-(2x-10)=7 x-2x+10=7 -x=7-10 -x=-3 x=3 Put x=3 in y=2x-10 y=2*3-10 y=-4
anonymous
  • anonymous
Graphically you can draw the lines and find the point of intersection.
anonymous
  • anonymous
There is one more method called Elimination :)

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anonymous
  • anonymous
y=2x-10 can be changed into 2x-y=10 now subtract equation 2 from 1 2x-y=10 x-y=7 ------------ x=3 put value of x in first equation you will get value of y.
anonymous
  • anonymous
oh
anonymous
  • anonymous
shahzadjalbani gave elimination method :)
anonymous
  • anonymous
ah i like that way better i think

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