Mathematics · Coordinate Geometry
Let PQR be a right-angled isosceles triangle, right-angled at Q(2, 1). If the equation of the line PR is 2x + y = 3, then the combined equation representing the pair of lines PQ and QR is:
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- 13x2 - 8xy - 3y2 + 20x + 10y - 25 = 0
- 23x2 + 8xy - 3y2 + 20x + 10y + 25 = 0
- 33x2 - 8xy - 3y2 - 20x - 10y - 25 = 0
- 43x2 + 8xy - 3y2 - 20x - 10y + 25 = 0✓
Correct answer
3x2 + 8xy - 3y2 - 20x - 10y + 25 = 0
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