In the diagram, is a diameter of circle O. If the slope of is , what is the slope of ?

A.

B.

C.

2

D.

-2

E.

-4

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126