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Question

anonymous · Answer

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badhi · Answer

so you know the characteristics of two perpendicular lines?

anonymous · Answer

Completely confused..:( @BAdhi

badhi · Answer

if there are two lines represented as below,
$y = m_1 x + c_1$
$y= m_2 x + c_2 $

if the two lines are parallel -> $ m_1 = m_2$
if the two lines are perpendicular -> $m_1m_2 = -1$

anonymous · Answer

so the first one? @BAdhi

texaschic101 · Answer

you have to find the slopes and compare them. If they are negative reciprocals of each other, then they are perpendicular. For instance, if the slope of one is 2/3 and the slope of the other one is -3/2, then they are perpendicular.
So we need to find the slopes and the best way to do that is to put them in y = mx + b form where m is your slope.

-8/3x + 9 = y....rearrange
y = -8/3x + 9
so the slope here is -8/3

8y = 3x - 32 -- divide everything by 8
y = 3/8x - 4

so yes....these have negative reciprocal slopes and that makes them perpendicular.
It is the first one :)

anonymous · Answer

@texaschic101 , thanks, you were right!:)

texaschic101 · Answer

YW :)