Wednesday, 19 December 2018

Pair of Straight lines: Class12th:DPP

Pair of Straight lines: 
Q1 Find the separate equations of lines represented by.    (8)


                               I.            x2-4y2 = 0
                              II.            3x2-7xy+4y2 = 0
                             III.            x2+2xy-y2 = 0
                             IV.            5x2-3y2=0

Q2 Find the joint equation of pair of lines passing through origin and perpendicular to the lines represented by ax2+2hxy+by2=0                                                                   (3)
Q3 Find the value of k ,if the slope of one of lines is given by 4x2+kxy+y2=0 is four times the other                                   (3)
Q4 Find p and q if the equation px2- 8xy +3y2+14x+2y+q=0 represents pair of perpendicular lines.                                   (4)
Q5 Find the acute angle between the lines  x2-4xy+y2=0                                                                                                                  (2)

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