can someone explain to me what this question may mean?

In the graph below, line k, y = -k makes a 45° angle with the x- and y-axes.

Rk: (2, 5) -

Question

can someone explain to me what this question may mean? 

In the graph below, line k, y = -k makes a 45° angle with the x- and y-axes. 

Rk: (2, 5) ->

anonymous · Answer

https://media.glynlyon.com/g_geo_2012/10/protra.gif

anonymous · Answer

yea thats why this question is kinda confusing me

anonymous · Answer

if kwas a constant.. the line would be horizontal and in the negative y region of the graph..Somethings wrong

jim_thompson5910 · Answer

Rk:(2,5) means "reflect the point (2,5) over the line k"

anonymous · Answer

but then that line k is actually the graph of y=x

anonymous · Answer

so is k the black line ?

jim_thompson5910 · Answer

I think it should be y = -kx

anonymous · Answer

sorry graph of y= -x

jim_thompson5910 · Answer

or y = -x actually

jim_thompson5910 · Answer

hmm thought so

anonymous · Answer

yeah.. typo.. what @jim_thompson5910  makes perfect sense.. reflect it using the line k as your mirror line

anonymous · Answer

if it was that won't the reflection be (-2,-5)?

jim_thompson5910 · Answer

you find the distance from the point to the line k

then you move that same distance from the line k, but on the other side of the line