Question

What is the slope of the line that passes through (2, 5) and (−1, 5)?

Answer 1

(2,5)(-1,5)....notice that ur y's are the same number...they are both 5.
This means that u have a horizontal line which has a slope of 0. If the y's are the exact same number, then u have a horizontal line.

if the x's would have been the same number, then u would have had a vertical line with an undefined slope