Will fan and medal, PLEASE HELP! Find the coordinates of the image after a reflection in the given line. problem in comments.

Question

anonymous · Answer

$$\left[\begin{matrix}-8 & 1 & -7 \ -7 & -5 & 1\end{matrix}\right]$$;y-axis

anonymous · Answer

can any of y'all help me @pooja195 @TheSmartOne @thomaster @Compassionate @AlexUchiha @EclipsedStar @welshfella @Whitemonsterbunny17

anonymous · Answer

@jigglypuff314 can you help me out again :)

welshfella · Answer

the y coordinates will be the same 
the x coordinates will have different signs

eg -4 would become 4

welshfella · Answer

gotta go right now

anonymous · Answer

Which are the y coordinates?! I have no idea what I'm doing with matrices @welshfella

cathyangs · Answer

The x coordinates flip signs, while the y coordinates stay the same, because flipping over the y axis is like turning the page of a book - the order of letters flip, but the line stays the same. In your matrix, I think the top values are the x-coordinates paired with the bottom values, which are y-coordinates. Hope this helps.

anonymous · Answer

So it would be $$\left[\begin{matrix}7 &-1 & 8\ 1 &-5  & -7\end{matrix}\right]$$ ??? @cathyangs

cathyangs · Answer

I think that is correct!

anonymous · Answer

thank you so much! @cathyangs