Question

Find the slope of the line through the pair of points. A(2, –3), P(2, 9)
A.0
B.2/3
C.-1/3
D.undefined

Answer 1

difference in Y / difference in x:
so, subtract the Y coordinates: -3-9 = -12
then subtract the X coordinates: 2-2=0

that gives -12/0 which is undefined, cause you can't divide by zero