what is the solution?

Question

Tickets for a high school football game cost $2.50 each if purchased in advance before the game. They cost $3.75 if bought at the gate the day of the game. For a particular game, 600 tickets were sold and the receipts were $1,750. How many tickets were sold in advance and how many were sold at the gate?

Answer 1

A=advance sales and G=game day sales

A+G=600

2.5A + 3.75G = 1750

I usually think elimination is easier than substitution, like this

250A + 250G = 150000

250A + 375G = 175000

Subtract

125G=25000

You finish it from here.