Question

Geometry

Given triangle ABC with coordinate A(-2,5),B(-2,2) and C(-4,1) and it’s image A’B’C’ with A’(2,1), B’(-1,1) and C’(-2,-1), find the line of reflection.

The line reflection is at y= __

Answer 1

(-2,5)  (2,1)    M= (0,3)
(-2,2)  (-1,1)   M= (-3/2,3/2)
(-4,1)  (-2,-1)  M= (-3,0)
slope= (3-0)/(0+3)=3/3=1
b   3=b
y=x+3 should be the line of refelction.