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If a,b,c are in AP then ax + by + c = 0 ...

If a,b,c are in AP then `ax + by + c = 0 ` represents

A

(1, -2)

B

(-1, 2)

C

(1, 2)

D

(-1, - 2).

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MODERN PUBLICATION-CONIC SECTIONS-EXERCISE
  1. The equation of straight line passing through the point (2, 3) and per...

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  2. The equations y=x sqrt3, y =1 are the sides of :

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  3. If a,b,c are in AP then ax + by + c = 0 represents

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  4. The coordinates of the foot of the perpendicular from (2,3) to the lin...

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  5. Find the orthocentre of the triangle formed by the lines xy = 0 and x+...

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  6. If the sum of the distances of a variable point from two perpendicular...

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  7. Point Q is symmetric to P (4, -1) with respect to the bisector of the ...

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  8. The radius of the circle, which is touched by the line y= x and has it...

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  9. Tangents drawn from the point (4, 3) to the circle x^2+y^2-2x-4y=0 are...

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  10. If l denotes the semi-latus rectum of the parabola y^2= 4ax and SP and...

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  11. The eccentricity of the ellipse : x^2+4y^2+8y-2x+1=0 is :

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  12. The equation of the tangent parallel to y=x drawn to x^2/3-y^2/2 =1 is...

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  13. A line through the point A (2, 0), which makes an angle of 30^@ with t...

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  14. The total number of tangents through the point (3, 5) that can be draw...

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  15. The co-ordinates of the foot of the perpendicular from (0, 0) upon the...

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  16. If C is the reflection of A (2, 4) in x-axis and B is the reflection o...

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  17. The line y=2t^2 intersects the ellipse x^2/9+y^2/4=1 in real points if...

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  18. The coordinates of the focus of the parabola described parametrically ...

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  19. A positive acute angle is divided into two parts whose tangents are 1/...

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  20. The angle between the line joining the foci of an ellipse to one parti...

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