What is the equation of the line written in general form?

Alex drew a circle with right triangle prq inscribed in it, as shown below: the figure shows a circle with points p, q, and r on it forming an inscribed triangle. side pq is a chord through the center and angle r is a right angle. arc qr measures 80 degrees.

Which of these triangle pairs can be mapped to each other using two reflections?

Reflect the point (7,0) across the y-axis