anonymous
  • anonymous
In the system shown below, what is the sum of the x-coordinates of all solutions? 7x^2+3y^2=187 3y^2-7x=47
Mathematics
schrodinger
  • schrodinger
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Mertsj
  • Mertsj
3y^2=47+7x from the second equation. Put that in the first equation in place of 3y^2
Mertsj
  • Mertsj
7x^2+7x+47=187
Mertsj
  • Mertsj
7x^2+7x-140=0 Divide by 7 x^2+x-20=0

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anonymous
  • anonymous
x=20?
Mertsj
  • Mertsj
(x+5)(x-4)=0 x=-5 or 4 So the sum of the x coordinates of the solutions is -5+4 or -1
anonymous
  • anonymous
nevermind i see
anonymous
  • anonymous
thanks!! :)
Mertsj
  • Mertsj
yw

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