i just need help with my algebra homework

Question

the equations P+7m+137 and C+4m+78 represent the number of cell phones P and digital cameras C sold in M months at an electronics store. write a equation for the total monthly sales T of phones and cameras.

Answer 1

I believe you meant the equations to be: P=7m+137 and C=4m+78

If that is the case, it can be solved this way: 

 

1) Add P and C

(7m+137)+(4m+78)

11m+215

 

 2) Make it all equal to T

 T=11m+215 <-- that is your answer