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If the equation ax^2 + 2hxy + by^2 + 2gx...

If the equation `ax^2 + 2hxy + by^2 + 2gx + 2fy + c = 0` resents a pair of parallel lines then prove that

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A DAS GUPTA-Pair of Straight Lines and Transformation of Axes-EXERCISE
  1. Find the condition that the one of the lines given by ax^2+2hxy+by^2=0...

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  2. Show that the area of the triangle formed by the lines ax^2+2hxy+by^2=...

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  3. A pair of perpendicular straight lines is drawn through the origin ...

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  4. Show that the centroid (x',y') of the triangle with sides ax^2+2hxy+by...

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  5. If the lines ax^2+2hxy+by^2=0 be two sides of a parallelogram and the...

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  6. The straight lines represented by (y-m x)^2=a^2(1+m^2) and (y-n x)^2=a...

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  7. Find the combined equation of the straight lines passing through the p...

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  8. If the equation ax^2 + 2hxy + by^2 + 2gx + 2fy + c = 0 resents a pair ...

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  9. If the pair of straight lines a x^2+2h x y+b y^2=0 is rotated about th...

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  10. The new equation of the curve 4(x-2y+1)^2+9(2x+y+2)^2 =25, if the lin...

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  11. The acute angle between the lines given by x^(2)+2(cosectheta)xy+y^(2)...

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  12. The difference of the slopes of the lines given by the equation x^2(se...

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  13. If the pair of straight lines x^2 - 2pxy - y^2 = 0 and x^2 - 2qxy -y^2...

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  14. The equation 12x^(2)+7xy-12y^(2)-18x+y+6=0 represents

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  15. The number of values of lambda for which the bisectors of the angle b...

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  16. If one of the lines of ax^(2)+2hxy+by^(2)=0 bisects the angle between ...

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  17. The equation (x+y+1)^2+k(x^2+y^2+1)=0 represents two straight lines th...

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  18. The equation 4x^(2)-24xy+11y^(2)=0 represents

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  19. The value of c^2 for which the lines joining the origin to the points ...

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  20. If pairs of opposite sides of a quadrilateral are x^(2)-7x+6=0 and y^(...

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