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Find the coordinates of the point (-5,7) when it is reflected across the line y=11.

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Use mid point formula.
But don't you need more than one coordinate?
mirror being mid point of the line joining the two points. \[\left\{ -5,11 \right\}\] now \[-5=\frac{x2-x1 }{ 2 }\] and \[11=\frac{ y2-y1 }{ 2 }\]

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Other answers:

you know x1 and y1 find x2 and y2
Did you get it .
I completely understand what you're saying, but I honestly have no idea how to solve for x2 and y2. I remember learning this, but I haven't used it in 2 years.
did you get the idea behind mid point
Yes I do!
Then take the given point as the first point in the case i.e (-5,7)
now use x1=-5 and y1=7
now use the formula that I have already posted
Wait, so wouldn't it be (-5,-7)?
Nevermind, let me resolve quick.
did you get is answer as (-5,15). If not I can give us an another approach

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