# Math Help - Line reflection - understanding question

1. ## [SOLVED] Line reflection - understanding question

Hopefully this is in the right section.

Little bit of trouble understanding what the question wants.

Does it mean for example to find the reflection that results in the second equation?

And even so...i'm a little unsure of the best way to go about it that would be quick...all the methods i'm thinking of would take pages..

(see attached)

Thank-you

2. Actually, i've come to realise there's a rotation of pi/2...
So just curious the method of putting this in the given form(and what exactly the form is...)...it's a little confusing.

3. L' is orthogonal to L.
So reflection gives the same line L'.

4. Originally Posted by zzzoak
L' is orthogonal to L.
So reflection gives the same line L'.
Thankyou for the reply.
I suppose i'm wondering what exactly x + By + C = 0 is. At the moment i'm thinking it's an equation of a transformation but this doesn't make much sense to me as it's usually done in matrix form.
EDIT: Is it actually just asking for equation 2 in a kind of different form? (no Ax for example)

5. $\pi$(L')= L' is 3x-5y+3=0.
Dividing by 3 gives
$x-\frac{5}{3}y+1=0$.

6. Originally Posted by zzzoak
$\pi$(L')= L' is 3x-5y+3=0.
Dividing by 3 gives
$x-\frac{5}{3}y+1=0$.
wth, that's all it was? Wanting the second equation in a different form?
I think i was mass over-complicating...damn...