Question

using the given points and line, determine the slope of the line (1,2) and (2,1)

Answer 1

Slope is the change in y over the change in x
So it's (1-2)/(2-1)
Which equals -1/1
So your slope is -1

Answer 2

Slope is equal to the change in y over change in x, which is rise over run.

(1-2)/(2-1)
-1/1
-1

Final answer: Slope=-1