Given a pair of points on a straight line
To Determine: The slope of the line
Solution:
The slope formula given two points is

The given points are

Substitute the given points into the formula to find the slope

The slope of the line is 0
Please note that a zero slope is just the slope of a horizontal line. The y-coordinate never changes no matter what the x-coordinate is.
Hence, the slope of the line is 0