JEE MATHEMATICS MCQ: PAIR OF STRAIGHT LINES

1 Easy

1 of 1

Analyzing +4 | -1

If two pairs of straight lines having equations

y^2+x y-12 x^2=0

and

a x^2+2 h x y+b y^2=0

have one line common, then

a=

View answer and explanation

Correct option: A

-3(2 h+3 b)

Option A (

-3(2 h+3 b)

) is correct because substituting

y=3x

into the second equation and solving for

a

yields this result.

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