First slide

Pair of straight lines

Question

If the area of the triangle formed by the pair of lines $8 x^{2} - 6 x y + y^{2} = 0$ and the line $2 x + 3 y = a (a < 0)$ is 7 then $a =$

Moderate

A

-28
B

28
C

24
D

-25

Solution

$a = 8, 2 h = - 6, b = 1$ , $l = 2, m = 3, n = - a$
$\frac{n^{2} \sqrt{h^{2} - a b}}{| a m^{2} - 2 h l m + b l^{2} |} = 7$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App