The equation ax2+2hxy+by2=0 represents a pair of perpendicular lines if

The equation $a x^{2} + 2 h x y + b y^{2} = 0$ represents a pair of perpendicular lines if

A
$a = 3, b = 4$
B
$a = 4, b = - 3$
C
$h = - 1$
D
$a = 11, b = - 11$

Solution:

Lines are perpendicular if $a + b = 0$

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