A line labelled Q is parallel to lines C and D. A straight line, AB, traveses through all the lines forming perpendicular. The points marked on C, Q, D are (7,7), (7,6), (7,7), respectively.

A software designer is mapping the streets for a new racing game. All of the streets are depicted as either perpendicular or parallel lines. The equation of the lane passing through A and B is -7x + 3y = -21.5. What is the equation of the central street PQ?

A.
-3x + 4y = 3

B.
-1.5x − 3.5y = -31.5

C.
2x + y = 20