Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

Login

Username

Password

Not registered yet?

#1 2013-05-09 04:51:46

mom
Full Member

Offline

equation of a parallel line

I am stumped again.

Find the equation of line L in standard form. L is parallel to y=1/3x.
I am not sure why I am thrown off. It shows line L with a point of (2,4)

I have y=-x+6 and I know that can't be correct because the slopw is 1/3 so is it y=-1/3x+6
I am really confused.
Please help to see what the answer is and why so that I can understand.

#2 2013-05-09 04:55:49

bob bundy
Moderator

Offline

Re: equation of a parallel line

hi Mom,

To be parallel it must have the same gradient, ie. 1/3

So y = (1/3)x + something..

(2,4) => 4 = (1/3)2 + something => something = 4 - 2/3

Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

#3 2013-05-09 04:56:51

anonimnystefy
Real Member

Offline

Re: equation of a parallel line

Well, we know that it must be of the form y=1/3 x+n, so we just substitute x=2 and y=4 and solve for n. Can you do that?

Last edited by anonimnystefy (2013-05-09 04:59:03)


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

#4 2013-05-09 04:58:02

mom
Full Member

Offline

Re: equation of a parallel line

Im still lost but thanks Bob

#5 2013-05-09 04:58:08

bob bundy
Moderator

Offline

Re: equation of a parallel line


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

#6 2013-05-09 20:10:34

stapel
Member

Offline

Re: equation of a parallel line

mom wrote:

Im still lost but thanks Bob

On which part are you lost? Thank you! wink

#7 2013-05-14 13:55:30

johnnie too lazy log in
Guest

Re: equation of a parallel line

simple, just note that it goes thru (0,0), so subtract from y and and x the 2 and the 4.
(y-4) = (1/3)(x-2)
that's all there is to it.
very simple.
the end.
lol. smile

Board footer

Powered by FluxBB