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. Which of the following represents the equation of a line that is perpendicular to Line A and that travels through point 
?
and 
. So here since you need to find a line perpendicular to a line with slope of 
, you're looking for the negative reciprocal 
. You can therefore eliminate choices 
and 
, which do not have the proper slope.
you know that for a point to pass through the point 
it will need to allow for 
to equal 
when 
equals 
. To find the 
term (in 
), take what you do know about the line:
to each side to isolate 
and you'll have your answer:
, so the correct equation is 
.
?
, you're looking for a slope of 
.
, where 
is the slope. Checking the answer choices quickly:
and 
will each give 
a positive coefficient, as your first step is to get 
on the opposite side of the equation from 
.
simplifies to a coefficient of 
:
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