First slide

Pair of straight lines

Question

If $x^{2} - y^{2} = 0$ , $l x + 2 y = 1$ form an isosceles triangle then $l =$

Moderate

A

1
B

2
C

3
D

0

Solution

$a = 1, 2 h = 0, b = - 1, l = l, m = 2, n = - 1$
$h (l^{2} - m^{2}) = (a - b) l m$

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