Posted by chris on Monday, March 14, 2011 at 4:32am.
Note that the two equations are not identical.
Rearrange the equations:
100- 4 Px + Py +40 = 0...(1)
100- 4 Py + Px +40 = 0...(2)
4Px-Py=140...(1a)
Px-4Py=-140...(1b)
Solve equations by elimination to get Px=Py=140/3
4*(1a)-(1b):
15Px=700, or Px=140/3
Similarly:
(1a)-4(1b):
-3Py=-420, or Py=140/3
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