Find the coordinates of the image of the point (4,2) when it is reflected across the line y=3

Answer 1

y=3 is a horizontal line, the point (4,2) is one unit below it, so reflecting it would put it one unit above it, so

(4,2) ----> (4,4)

Answer 2

Reflect point -4,5 along y =4 followed by y =1