Answer:

Step-by-step explanation:
I am assuming that you mean (4,−9) and (8, -3).

Hope this helps.
Answer:
(24,13)
Step-by-step explanation:
24 is Sarah's age.
13 is Mike's age.
System:

I hope this helped!
Answer:
It could be both 2 positives, or 2 negatives.
Step-by-step explanation:
This is because a negative times a negative is a positive, and a positive times a positive is a positive.
Answer:
B. Commutative Property of Multiplication
Step-by-step explanation:
The answer is in the picture
Sorry I can’t copy and pasted it here