What is the slope of the line that passes through the points (13,-8) and (-11,4)

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60

We just started the introduction into circles and i have no idea how to do this.

How do you determine if an ordered pair is a solution to a given equation?