Write the equation of the line that is perpendicular to the line y = three halvesx + 4 and passes through the point (-6, 3).
y = three halvesx - 1
y = three halvesx + 3
y = -two thirdsx - 1
y = -two thirdsx + 3
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OpenStudy (anonymous):
@TuringTest @TheSmartOne @King.Void.
OpenStudy (king.void.):
Not good at Math.
Sorry.
OpenStudy (anonymous):
ok thank you anyways @King.Void.
OpenStudy (anonymous):
@misty1212
OpenStudy (misty1212):
HI!!
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OpenStudy (anonymous):
Hi!!!
OpenStudy (misty1212):
it would be good to use the equation tool, so you don't have to say things like "three halves"
that is why people invented numerals
OpenStudy (misty1212):
\[y=\frac{3}{2}x+4\]
OpenStudy (misty1212):
you know what the slope of that is?
OpenStudy (anonymous):
no @misty1212
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OpenStudy (misty1212):
i bet you do!
the slope of \(y=mx+b\) is \(m\) so the slope of \(y=\frac{3}{2}x+4\) is ?
OpenStudy (anonymous):
uhhh 3/2
OpenStudy (misty1212):
yes
OpenStudy (anonymous):
ok
OpenStudy (anonymous):
srry math is not my greatest subject so please bear w. me
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OpenStudy (misty1212):
next question is, what is the slope of the a line perpendicular to a line with slope \(\frac{3}{2}\) ?
OpenStudy (anonymous):
i have no clue may you explain to me more
OpenStudy (misty1212):
take the number \(\frac{3}{2}\) and flip it
then put a minus sign in front
it is called the "negative reciprocal"
OpenStudy (anonymous):
ok so th negative reciprocal is -2/3
OpenStudy (misty1212):
right
that narrows your choices
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OpenStudy (anonymous):
|dw:1422198212012:dw|
OpenStudy (anonymous):
ok so we will eliminate c and d right
OpenStudy (misty1212):
yea so it is one of the last two choices
\[y=-\frac{2}{3}x+3\] or \[y=-\frac{2}{3}x-1\]
OpenStudy (misty1212):
because both of those have slope \(-\frac{2}{3}\) as we now know that the slope of \(y=mx+b\) is \(m\)
OpenStudy (anonymous):
yes
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OpenStudy (misty1212):
how are you going to choose?
OpenStudy (anonymous):
ummm find the slope-intercept form
OpenStudy (anonymous):
y= mx +b i think
OpenStudy (misty1212):
you can do that
start with the point slope form
\[y-3=-\frac{2}{3}(x+6)\] and solve for \(y\)
OpenStudy (anonymous):
ummm may you help me w. this
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OpenStudy (anonymous):
y-3 =-2/3x -4 right
OpenStudy (misty1212):
yea, then add 3 to get \(y\) by itself
OpenStudy (anonymous):
ok
OpenStudy (anonymous):
y-3+3=-2/3x -4 + 3
OpenStudy (misty1212):
and...
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OpenStudy (anonymous):
and???
OpenStudy (anonymous):
@misty1212
OpenStudy (misty1212):
what is \(-3+3\) ?
OpenStudy (anonymous):
0
OpenStudy (misty1212):
and what is \(-4+3\)?
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OpenStudy (anonymous):
-1 @misty1212
OpenStudy (misty1212):
ok good
then final answer is
\[y=-\frac{2}{3}x-1\]
OpenStudy (anonymous):
that means my answer is d right
OpenStudy (anonymous):
thank you may you help me w .another and i will repost