anonymous
  • anonymous
3x - y = -4 5x + 4y = -8
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
What do we have to do ?
anonymous
  • anonymous
find the points that it would be on the graph
anonymous
  • anonymous
Umm it would be on a graph oh darn lol i thought a fraction

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anonymous
  • anonymous
Hero will be here to help you
Mertsj
  • Mertsj
From the first equation y = 3x+4 Replace y in the second equation and solve. Can you do that this time?
anonymous
  • anonymous
And some others that are a bit smart :P
anonymous
  • anonymous
Solve simultaneously multiply Eq1 by4 and andd to Eq2 to get x
anonymous
  • anonymous
x=-24/17
Mertsj
  • Mertsj
\[5x+4(3x+4)=-8\]
anonymous
  • anonymous
I have 17x + 16 = -8. What to do after that?
Mertsj
  • Mertsj
Subtract 16 from both sides.
anonymous
  • anonymous
for x I have -1.41
Mertsj
  • Mertsj
that it correct but it might be better to leave it in it's exact form which is -24/17
Mertsj
  • Mertsj
Because now you have to find y which is 3x+4
Mertsj
  • Mertsj
\[y=3(-\frac{24}{17})+4\]
Mertsj
  • Mertsj
\[y=\frac{-72}{17}+4\]
Mertsj
  • Mertsj
\[y=\frac{-72}{17}+\frac{68}{17}=\frac{-4}{17}\]
Mertsj
  • Mertsj
So the solution is (-24/17,-4/17)
anonymous
  • anonymous
Thanks

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