JEE MATHEMATICS MCQ: STRAIGHT LINES

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Application +4 | -1

If the lines

x=a+m, y=-2

and

y=m x

are concurrent, the least value of

|a|

View answer and explanation

Correct option: C

2 \sqrt{2}

Option C (

2 \sqrt{2}

) is correct because the least value of

|a|

is found by ensuring the discriminant of the quadratic equation in 'm' is non-negative.

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x-3 y=p, a x+2 y=q

a x+y=r

\left\{ {a{t_1}{t_2},\;a\left( {{t_1} + {t_2})\} ,\{ a{t_2}{t_3},a({t_2} + {t_3}} \right)} \right\},\;\left\{ {a{t_3}{t_1},\;a\left( {{t_3} + {t_1}} \right)} \right\}

y = 2\;x + 4

6x = 3y + 5

{x^2} + {y^2} + 2xy - 8ax - 8ay - 9{a^2} = 0

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x+3 y=7

\left( {{x^2} + 7xy + 2{y^2}} \right)\left( {y - 1} \right) = 0