Are you asking for the letter or what the line is called because if it's just the letter then it is r if it is the name then its a plane intersect.
Answer:
Neither A nor B
Step-by-step explanation:
The set of pairs, where the front member of every sequence pair must be unique.
Answer:
-1/2
Step-by-step explanation:
The slope is the change in y over the change in x.

For this question:

Answer:
Step-by-step explanation:

A square has 4 right angels and 4 sides with equal angels ;)