JEE MATHEMATICS MCQ: STRAIGHT LINES

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Application +4 | -1

Let

{ax}+{by}+{c}=0

be a variable straight line, where

{a}, {b}

and

{c}

are

1^{\text {st}}, 3^{\text {rd}}

and

7^{\text {th}}

terms of an increasing A.P. respectively. Then the variable straight line always passes through a fixed point which lies on-

View answer and explanation

Correct option: D

x^2+y^2=13

Option D (

x^2+y^2=13

) is correct because the variable line always passes through a fixed point (2,-3), which lies on the circle

x^2+y^2=13

More Questions from STRAIGHT 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