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 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
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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

RealityWillSlapYou
 one year ago
Best 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?

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

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

phi
 one year ago
Best ResponseYou've already chosen the best response.1but 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

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

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

phi
 one year ago
Best ResponseYou've already chosen the best response.1for 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 ?

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

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

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

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

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

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

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

phi
 one year ago
Best ResponseYou've already chosen the best response.1no 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 ?

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

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

phi
 one year ago
Best ResponseYou've already chosen the best response.13/1 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"

phi
 one year ago
Best ResponseYou've already chosen the best response.1the 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 ?

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

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

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

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

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

phi
 one year ago
Best ResponseYou've already chosen the best response.1so 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 ?

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

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

phi
 one year ago
Best ResponseYou've already chosen the best response.1yes, \[y= \frac{1}{3} \cdot 3 \] 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 ?

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

phi
 one year ago
Best ResponseYou've already chosen the best response.1if 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

phi
 one year ago
Best ResponseYou've already chosen the best response.1y = −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 ?

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

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

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