Answer:
See explanation
Step-by-step explanation:
Assuming your system is:


Then make x the subject in the first equation to get:

Put this equation into the second equation to get:





This means that:


This right answer is D.
because -65 divided by -13 is 5
The son is 4 years old and the dad is 24 years old.
D. because for every hour it goes down 5 degrees and since there is a 1 hour gap in between 7 am and 9 am