JEE MATHEMATICS MCQ: STRAIGHT LINES

1 Easy

1 of 1

Analyzing +4 | -1

If a variable line drawn through the intersection of the lines

\frac{x}{3}+\frac{y}{4}=1

and

\frac{x}{4}+\frac{y}{3}=1

, meets the coordinates axes at

A

and

B

, then the locus of the mid-point of

A B

, is

View answer and explanation

Correct option: A

7 x y=6(x+y)

Option A (

7 x y=6(x+y)

) is correct because it is the locus of the midpoint of AB, derived from the intersection of the given lines.

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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

(3,8)

x+3 y=7

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