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The straight lines joining the origin to...

The straight lines joining the origin to the points of intersection of the line `2x+y=1` and curve `3x^2+4xy-4x+1=0` include an angle:

A

`(pi)/2`

B

`(pi)/3`

C

`(pi)/4`

D

`(pi)/6`

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The correct Answer is:
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TARGET PUBLICATION-PAIR OF STRAIGHT LINES-COMPETITIVE THINKING
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  10. The line 5x+y-1=0 coincides with one of the lines given by 5x^(2)+xy-k...

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  12. The angle between the lines in x^2-xy-6y^2-7x+31y-18=0 is

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