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Straight Lines and Pair of Straight Lines

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  1. 251.If non zero numbers a, b, c are in H.P., then the straight line [x a + y b + 1 c = 0] alwa…
  2. 252.If [( a,a^2 )] falls inside the angle made by the lines [y = x 2,] x > 0 and y = 3x, x > 0…
  3. 253.The line L given by [x 5 + y b = 1] passes through the point [( 13,32 )].
  4. 254.A ray of light along [x + 3 y = 3 ] gets reflected upon reaching X-axis, the equation of t…
  5. 255.Let PS be the median of the triangle with vertices P(2, 2), Q(6, -1) and R(7, 3).
  6. 256.The number of points, having both co-ordinates as integers, that lie in the interior of th…
  7. 257.If a variable line drawn through the intersection of the lines [x 3 + y 4 = 1] and [x 4 + …
  8. 258.Let k be an integer such that the triangle with vertices (k, -- 3k), (5, k) and (--k, 2) h…
  9. 259.A square, of each side 2, lies above the x-axis and has one vertex at the origin.
  10. 260.The sides of a rhombus ABCD are parallel to the lines, x - y + 2 = 0 and 7x - y + 3 = 0.
  11. 261.In a triangle ABC, coordinates of A are (1, 2) and the equations of the medians through B …
  12. 262.Lines are drawn parallel to the line 4x -- 3y + 2 = 0, at a distance [3 5] from the origin…
  13. 263.Two sides of a parallelogram are along the lines, x + y = 3 & x -- y + 3 = 0.
  14. 264.If 5, 5r, 5r2 are the lengths of the sides of a triangle, then r cannot be equal to :
  15. 265.A straight line L at a distance of 4 units from the origin makes positive intercepts on th…
  16. 266.If the system of linear equations x -- 2y + kz = 1 2x + y + z = 2 3x -- y -- kz = 3 has a …
  17. 267.If the two lines x + (a -- 1) y = 1 and 2x + a2y = 1 (a[ ]R -- 0, 1) are perpendicular, th…
  18. 268.The set of all possible values of [ ] in the interval (0, [ ]) for which the points (1, 2)…
  19. 269.Two vertical poles AB = 15 m and CD = 10 m are standing apart on a horizontal ground with …
  20. 270.A ray of light coming from the point (2, [2 3 ]) is incident at an angle 30o on the line x…
  21. 271.Let two points be A(1, --1) and B(0, 2).
  22. 272.Let the centroid of an equilateral triangle ABC be at the origin.
  23. 273.The equation of one of the straight lines which passes through the point (1, 3) and makes …
  24. 274.A man is walking on a straight line.
  25. 275.Let the equation of the pair of lines, y = px and y = qx, can be written as (y - px) (y - …
  26. 276.The point P (a, b) undergoes the following three transformations successively : (a) reflec…
  27. 277.Let A be the set of all points ([], []) such that the area of triangle formed by the point…
  28. 278.If p and q are the lengths of the perpendiculars from the origin on the lines, x cosec [] …
  29. 279.Let the point [P(, )] be at a unit distance from each of the two lines L_1: 3 x-4 y+12=0, …
  30. 280.A line, with the slope greater than one, passes through the point A(4,3) and intersects th…
  31. 281.The equations of the sides [AB, BC] and CA of a triangle ABC are [2 x+y=0, x+p y=39] and x…
  32. 282.Let A(1,1), B(-4,3), C(-2,-5) be vertices of a triangle A B C, P be a point on side B C, a…
  33. 283.Let m_1, m_2 be the slopes of two adjacent sides of a square of side a such that [a^2+11 a…
  34. 284.The distance of the origin from the centroid of the triangle whose two sides have the equa…
  35. 285.Let []1, []2 ([]1 2) be the values of [] fo the points ([], -3), (2, 0) and (1, []) to be …
  36. 286.Let [(, )] be the centroid of the triangle formed by the lines 15 x-y=82,6 x-5 y=-4 and 9 …
  37. 287.The combined equation of the two lines ax+by+c=0 and a'x+b'y+c'=0 can be written as (ax+by…
  38. 288.Let B and C be the two points on the line y+x=0 such that B and C are symmetric with respe…
  39. 289.The straight lines [l_1] and [l_2] pass through the origin and trisect the line segment of…
  40. 290.Let [C(, )] be the circumcenter of the triangle formed by the lines 4 x+3 y=69 4 y-3 x=17,…
  41. 291.Let [R] be the interior region between the lines 3 x-y+1=0 and x+2 y-5=0 containing the or…
  42. 292.Let [A] be the point of intersection of the lines 3 x+2 y=14,5 x-y=6 and [B] be the point …
  43. 293.In a [ A B C], suppose y=x is the equation of the bisector of the angle B and the equation…
  44. 294.Let A(a, b), B(3,4) and C(-6,-8) respectively denote the centroid, circumcentre and orthoc…
  45. 295.Let [, , , Z] and let [A(, ), B(1,0), C(, )] and D(1,2) be the vertices of a parallelogram…
  46. 296.Let two straight lines drawn from the origin [O] intersect the line 3 x+4 y=12 at the poin…
  47. 297.The equations of two sides [AB] and [AC] of a triangle [ABC] are 4 x+y=14 and 3 x-2 y=5, r…
  48. 298.A ray of light coming from the point [P(1,2)] gets reflected from the point [Q] on the x-a…
  49. 299.A rod of length eight units moves such that its ends A and B always lie on the lines x-y+2…
  50. 300.Let the points ((11)/(2), ) lie on or inside the triangle with sides x+y=11, x+2 y=16 and …