The slope of the linear function containing these points is of 1.
A linear function is modeled by:
[tex]y = mx + b[/tex]
In which:
In this problem, the points given are: (-24,-21) and (-18,-15), hence, the slope is given by:
[tex]m = \frac{-15 - (-21)}{-18 - (-24)} = \frac{6}{6} = 1[/tex]
You can learn more about linear functions at https://brainly.com/question/16302622