At a celtic music festival, the tickets for the main stage cost $45, and tickets for the second stage cost $20.
325 people attended the festival, and there was $12,000 worth of tickets sold.
a.) write a system of equations "m" to denote the number of tickets sold for the main stage, and "s" the number of tickets sold for the second stage.
b.) how many attended the main stage?
c.) how many attended the second stage?
you so much for your

A.) m + s = 325 
     45m + 20s = 12,000

b.) 220 people attended main stage

c.) 105 people attended second stage

How you figure this out:

You can first find the value of (s) by using m + s = 325 and subtracting m from both sides. This leaves you with s = -m + 325 as the value of s. Now substitute that into the equation 45m + 20s = 12,000 and you should have something like this -> 45m + 20 (-m + 325) = 12,000   Now distribute the 20 to both (-m) and (325) which then leaves you with this ->  45m - 20m + 6,500 = 12,000
Next thing you would do is combine like terms which in the case is 45m and -20m. Now combine those term to get -> 25m + 6,500 = 12,000  Now you would subtract 6,500 from both sides and then that would leave you with this  -> 25m = 5,500 Lastly divide 25 into both sides to get your solution for m,  m = 220.  Now that you know the value of (m), substitute it into the equation   M + S = 325 and it would look like this -> 220 + s = 325  now you would subtract 220 from both sides to get your solution for s, s = 105  

I really hope this helps and let me know if you have any questions! :)

Ac equals 35 cm long