Stuck on this one:

Question

find the slope of the line passing through each pair of points or stat that the slope is undefined. assume that all variables represent positive real numbers. then indicate whether the line through the points rises, falls, is horizontal or is vertical
(0,a) and (b,0)

Answer 1

slope = -a/b

the rest of your question can only be answered if we know that values of a and b

Answer 2

Thank you. That is all that was written in the book.