Exercise 7 Page 577

To find the coordinates of a point reflected across a line, we need to follow a few steps.

• Step $1\text{:}$ Plot the preimage point and the line of reflection on the coordinate plane.
• Step $2\text{:}$ Draw a line that is perpendicular to the given line of reflection and passes through the preimage point.
• Step $3\text{:}$ Measure the distance from the preimage point to the line. Then locate the reflected image the same distance from line the given line on the opposite side.