Prove: QR Passes Through O If PQ, PR on xy=c2 Inclined Equally

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SUMMARY

The discussion centers on proving that if points P, Q, and R lie on the hyperbola defined by the equation xy=c² and the segments PQ and PR are inclined equally to the coordinate axes, then the segment QR must pass through the origin O. Participants clarify that "inclined equally" indicates that the slopes of PQ and PR are negatives of each other, suggesting a symmetry in their orientation relative to the axes. This understanding is crucial for establishing the geometric relationship required for the proof.

PREREQUISITES
  • Understanding of hyperbolas, specifically the equation xy=c².
  • Knowledge of slope and its geometric implications in coordinate geometry.
  • Familiarity with the concept of symmetry in geometric figures.
  • Basic skills in proving geometric theorems.
NEXT STEPS
  • Study the properties of hyperbolas, focusing on their equations and characteristics.
  • Learn about the relationship between slopes and angles in coordinate geometry.
  • Explore geometric proofs involving symmetry and their applications.
  • Investigate the implications of points lying on conic sections in relation to coordinate axes.
USEFUL FOR

Students in geometry, mathematics educators, and anyone interested in advanced geometric proofs involving conic sections and their properties.

Michael_Light
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Homework Statement



Given that P,Q and R lie on the hyperbola xy=c2, prove that if PQ and PR inclined equally to the coordinate axes, then QR passes through O.

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The Attempt at a Solution



I don't understand what does ''PQ and PR are inclined equally to the coordinate axes'' means.. can anyone explain?
 
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This means that their slopes are opposites, I believe. In other words, if the slope of PQ is m, then the slope of PR is -m.
 
I'd have to say, it sounds to me like the slope along x = slope along y, it's symmetric under swapping x and y
 

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