Isnt there a youtube video with that? Im not sure... But thats where ill look for proof.. :)
I wrote it for you because i didnt know how to write it out in a way that made sense
hope this works! xx
Answer:

Step-by-step explanation:
Since the slope is -5 is either C or D. Let's replace
in either to see what we get.
C:
Nope.
D:
Good!
Try solving for the variable and get everything to one side
Answer: x < -1
Step-by-step explanation:
•Solve:
x + 6 < 5
• Subtract 6 on both sides:
x + 6 < 5
-6 -6
—————-
• Result:
x < -1