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Condition that a pair of lines are at ...

Condition that a pair of lines are at right angle is

A

sum of the coefficients of `x^(2)` and `y^(2)=0`

B

`x y` term is absent

C

constant term is absent

D

none of these

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The correct Answer is:
A
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HIMALAYA PUBLICATION-Pair Of Lines-QUESTION BANK
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  5. The angle between the lines x^(2)+4 x y-y^(2)=0 is

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  6. Acute angle between the lines y^(2)-2 sqrt(3) x y+3 x^(2)=0 is

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  7. If x^(2)+k y^(2)+x-y=0 represents a pair of lines then k=

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  8. Angle between the lines sqrt(3)(x^(2)+y^(2))-4 x y=0 is

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  9. Angle between the lines x^(2)+sqrt(17) x y+2 y^(2)=0 is

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  10. If k x^(2)-y^(2)+2 x-y=0 represents a pair of lines, then k=

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  11. The joint equation of the straight lines x + y = 1 and x - y = 4 is

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  12. The combined equation of y -axis and the line x-1=0 is

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  13. The sum of the slopes of the lines represented by 4x^(2)+2hxy-7y^(2)=0...

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  14. If the equation x^(2)+y^(2)+2gx+2fy+1=0 represents a pair of lines t...

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  15. Equation of the separate lines of the pair of lines, whose equation is...

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  16. If the slope of one of the lines gives by ax^(2)+2hxy+by^(2)=0 is 5 ti...

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  17. If ax^(2)-y^(2)+4x-y=0 represents a pair of lines then a ...

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  18. The distance between the pair of parallel linesx^(2) + 2xy + y^(2) - 8...

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  19. The lines represented by ax^(2)+2hxy+by^(2)=0 are perpendicular to ea...

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  20. The area enclosed by the pair of lines xy = 0, the line x -4 = 0 and y...

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