Final answer:
The slope of the line that contains the given points X: 5, 6, 7, 8 and Y: -5, -6, -7, -8 is -1.
Step-by-step explanation:
The slope of a line can be calculated using the formula:
slope = (change in y-coordinates) / (change in x-coordinates)
For the given points X: 5, 6, 7, 8 and Y: -5, -6, -7, -8, we can calculate the slope as
slope = (-6 - (-5)) / (6 - 5) = -1 / 1 = -1.
So, the slope of the line that contains these points is -1.