cassidyohrt
Find the coordinates of the point (-5,7) when it is reflected across the line y=11.
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punnus
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Use mid point formula.
cassidyohrt
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But don't you need more than one coordinate?
punnus
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mirror being mid point of the line joining the two points.
\[\left\{ -5,11 \right\}\]
now
\[-5=\frac{x2-x1 }{ 2 }\]
and
\[11=\frac{ y2-y1 }{ 2 }\]
punnus
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you know x1 and y1 find x2 and y2
punnus
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Did you get it .
cassidyohrt
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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.
punnus
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did you get the idea behind mid point
cassidyohrt
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Yes I do!
punnus
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Then take the given point as the first point in the case i.e
(-5,7)
punnus
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now use x1=-5 and y1=7
punnus
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now use the formula that I have already posted
cassidyohrt
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Wait, so wouldn't it be (-5,-7)?
cassidyohrt
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Nevermind, let me resolve quick.
punnus
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did you get is answer as (-5,15). If not I can give us an another approach