Question

A triangle, ΔABC, is reflected across the x-axis to have the image ΔA'B'C' in the standard (x,y) coordinate plane; thus, A reflects to A'. The
coordinates of point A are (c,d). What are the coordinates of point A'?

Answer 1

Reflect over x-axis=negate y-values
so
if A (c,d)
A' (c,-d)