X 5 19 33 47 y -1 -6 -36 -216 is this relationship linear exponential or neither

An energy plant is looking into putting in a system to remove harmful pollutants from its emissions going into earth's atmosphere. the cost of removing the pollutants can be modeled using the function c = 25000p/100 -p what is the vertical asymptote?

What is the slope of the line that contains the points (4,8) and (9,8)? what type of line is it?

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2