Example 22 Assuming that straight lines work as the plane mirror for a point

Example 22 Assuming that straight lines work as the plane mirror for a point, find the image of the point (1, 2) in the line x – 3y + 4 = 0 . 2) in the line x - 3y + 4 = 0 . Example 22 Assuming that straight lines work as the plane [...]