“No one can make you feel inferior without your consent.” –Eleanor Roosevelt
Lecture - 16 Chapter 10 Straight Lines
| MISCELLANEOUS EXERCISE |
Question 24. A person standing at the junction (crossing) of two straight paths represented by the equations 2x – 3y + 4 = 0 and 3x + 4y – 5 = 0 wants to reach the path whose equation is 6x – 7y + 8 = 0 in the least time. Find equation of the path that he should follow.
Question 23. Prove that the product of the lengths of the perpendiculars drawn from the points (\sqrt{a^2-b^2}, 0) and (-\sqrt{a^2-b^2}, 0) to the line \frac{x}{a} \cos \theta + \frac{y}{b} \sin \theta = 1 is b^2 .
Question 22. A ray of light passing through the point (1, 2) reflects on the x-axis at point A and the reflected ray passes through the point (5, 3). Find the coordinates of A.
Question 21. Find equation of the line which is equidistant from parallel lines 9x + 6y – 7 = 0 and 3x + 2y + 6 = 0.
Question 20. If sum of the perpendicular distances of a variable point P (x, y) from the lines x + y – 5 = 0 and 3x – 2y +7 = 0 is always 10. Show that P must move on a line.
