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Select the equations that are parallel and perpendicular to y = −3x − 1 and that pass through the point (3, 1).
A. parallel: y = −3x + 6
perpendicular: y = (1/3)x + 2(2/3)
B. parallel: y = −3x + 10
perpendicular: y = (1/3)x
C. parallel: y = (1/3)x
perpendicular: y = −3x
D. parallel: y = (1/3)x + 1
perpendicular: y = 3x − 1
 one year ago
 one year ago
Select the equations that are parallel and perpendicular to y = −3x − 1 and that pass through the point (3, 1). A. parallel: y = −3x + 6 perpendicular: y = (1/3)x + 2(2/3) B. parallel: y = −3x + 10 perpendicular: y = (1/3)x C. parallel: y = (1/3)x perpendicular: y = −3x D. parallel: y = (1/3)x + 1 perpendicular: y = 3x − 1
 one year ago
 one year ago

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RealityWillSlapYouBest ResponseYou've already chosen the best response.0
@SmokeysTheName, Right here!
 one year ago

SmokeysTheNameBest ResponseYou've already chosen the best response.0
ohhh man, remember i said i couldn't help? but here @phi might be able to
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
Oh, oops! Sorry about that.... :)
 one year ago

SmokeysTheNameBest ResponseYou've already chosen the best response.0
@hero can you help with this?
 one year ago

HeroBest ResponseYou've already chosen the best response.1
Pretty easy stuff @SmokeysTheName
 one year ago

SmokeysTheNameBest ResponseYou've already chosen the best response.0
its been forever since ive done this and i can't remember /: so can you help him?
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
Umm.... I not really sure.. :
 one year ago

HeroBest ResponseYou've already chosen the best response.1
m1 = 3 So m2 has to be a number such that when multiplied by m1, their product is 1.
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
Then 1 x 1 = 1
 one year ago

HeroBest ResponseYou've already chosen the best response.1
m1 = 3 Multiply 3 by something to get 1
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
I have no clue..... :
 one year ago

SmokeysTheNameBest ResponseYou've already chosen the best response.0
is that even possible @hero?
 one year ago

HeroBest ResponseYou've already chosen the best response.1
So that's basically the slope of the second equation.
 one year ago

SmokeysTheNameBest ResponseYou've already chosen the best response.0
oh yeah xD lol i dont like fractions so i didnt think of it. my bad okay ill stay out of this..
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
Oh, why is math so hard for me to understand?!
 one year ago

HeroBest ResponseYou've already chosen the best response.1
So now, you have the slope and the point. Use the point slope formula to figure out the value of b.
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
Y U NO WORK FOR ME MATH?! (ノಠ益ಠ)ノ
 one year ago

phiBest ResponseYou've already chosen the best response.1
sometimes it helps to watch these videos http://www.khanacademy.org/math/trigonometry/graphs/parallel_perpendicular/v/equationsofparallelandperpendicularlines
 one year ago

SmokeysTheNameBest ResponseYou've already chosen the best response.0
phi is right, khan acad vids are great to watch
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
@phi, in the video he was using two points and my question only has one point so how can I solve it the same way?
 one year ago

phiBest ResponseYou've already chosen the best response.1
at the very end he does a problem like yours.
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
Oh, my video sever crashed after the second equation.
 one year ago

phiBest ResponseYou've already chosen the best response.1
but this video assumes you know about slopes and equations of lines (he has videos on all of that) for you problem, you should know that when you see y = mx +b m is the slope. the number multiplying the x is the slope
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
I will start it back up again, but it will take 2 min.
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
I tried to solve it (I think I did it wrong) and is it C?
 one year ago

phiBest ResponseYou've already chosen the best response.1
for you problem, you should know that when you see y = mx +b m is the slope. the number multiplying the x is the slope so what is the slope of your line y = −3x − 1 ?
 one year ago

phiBest ResponseYou've already chosen the best response.1
do you see a number in front of the x ?
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
So is the answer B?
 one year ago

phiBest ResponseYou've already chosen the best response.1
yes, 3 is the slope (that is why people came up with this kind of equation, you can read off the slope easily)
 one year ago

phiBest ResponseYou've already chosen the best response.1
from the video, you learned that parallel lines have what kind of slope ?
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
The same slope
 one year ago

phiBest ResponseYou've already chosen the best response.1
look at your 4 choices. which choices have the correct slope of 3 for the parallel line ?
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
Well it's A or B....... I think it's B
 one year ago

phiBest ResponseYou've already chosen the best response.1
no need to guess. now for the perpendicular line. Its slope is the negative inverse (or negative reciprocal) that means "flip" the slope and multiply by 1. For example if you had slope =2 \[ \frac{2}{1} > \frac{1}{2}\] can you do that for 3 ?
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
\[\frac{ 3 }{ 1 }?\]
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
Or\[\frac{ 1 }{ 3 }?\]
 one year ago

phiBest ResponseYou've already chosen the best response.1
3/1 is 3 start with 3 or 3/1 minus it :  3/1 is +3/1 now flip it : 1/3 you know you did it right if it is the opposite sign of 3, and it's "upside down"
 one year ago

phiBest ResponseYou've already chosen the best response.1
the slope of the perpendicular is 1/3 look at choices A or B. can we rule out either choice because it does not have 1/3 for the slope of the perpendicular line ?
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
We can rule out A, right?
 one year ago

phiBest ResponseYou've already chosen the best response.1
for choice A, what is the number in front of the x for the perpendicular line ?
 one year ago

phiBest ResponseYou've already chosen the best response.1
A. parallel: y = −3x + 6 perpendicular: y = (1/3)x + 2(2/3)
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
So we rule out B?
 one year ago

phiBest ResponseYou've already chosen the best response.1
B. parallel: y = −3x + 10 perpendicular: y = (1/3)x what is the slope for the perpendicular line ?
 one year ago

phiBest ResponseYou've already chosen the best response.1
so both A and B pass. we have to use the last bit of info pass through the point (3, 1) that says that when x=3 y must = 1 test choice B, perpendicular (because it looks the easiest) y = (1/3)x replace x with 3 and do the arithmetic what do you get ?
 one year ago

phiBest ResponseYou've already chosen the best response.1
replace x with 3 that means wherever you see an x, put a 3 in its place.
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
okay give me a min.
 one year ago

phiBest ResponseYou've already chosen the best response.1
yes, \[y= \frac{1}{3} \cdot 3 \] you can think of the 3 as 3/1 or \[y= \frac{1}{3} \cdot \frac{3}{1} \] when you multiply fractions, multiply top times top and bottom times bottom you get \[y= \frac{3}{3} \] can you simplify this ?
 one year ago

phiBest ResponseYou've already chosen the best response.1
so (3,1) is on this line. this is the choice
 one year ago

phiBest ResponseYou've already chosen the best response.1
if we put x=3 in choice A, we will not get y=1 btw, we should check the parallel line can you do that ? parallel: y = −3x + 10 what do you get if you replace x with 3
 one year ago

phiBest ResponseYou've already chosen the best response.1
y = −3x + 10 if this does not give you y=1 when x=3 then it is not the line. But it does give y=1 so choice B. Does any of this make sense ?
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
How many more questions can you help me with?
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
Three, but I'm really bad at math.
 one year ago

RealityWillSlapYouBest ResponseYou've already chosen the best response.0
I posted one of them in algebra
 one year ago
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