Question

Determine the slope of the line that contains the points E(6,3) & F(-6,3). Select one:

Answer 1

slope is undefined because the equation of that is y=3

Answer 2

the slope can be calculated: 

a=(y_2-y_1)/(x_2-x_1 ) = (3-3)/(-6-6)= 0/-12 = 0

The slope must be 0. 

Hope that helped.