How do i find an equation of a line with (-6,5), (-4,-9) as the points on the line?

Tiara buys the pizza shown below: a circular pizza is shown. the edge of one slice is marked ab. what does the curve ab represent?

Ithink i know it but i want to be sure so can you me out ?

Find │7│. a. 1 over 7 b. –7 c. 7 asap i always mark brailiest who me so