What is the equation for the line of symmetry in this reflection? coordinates below?

S

Someone...

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-Triangle 1
coordinates: A(-4,5) B(-4,2) C(-1,4)
-Triangle 2
coordinates: A'(2,-1) B'(-1,-1) C'(1,2) I'm using the y=mx+b method but am a little stuck.
I have y= x+3 (space before x is the missing #)
 
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