Question 917265

x, price of advanced ticket
y, price of same-day ticket


That combined cost:  {{{x+y=50}}}


The one performance:  {{{30x+25y=1325}}}


Two linear equation in two unknown variables.  Simplify the revenue equation first, and then solve the resulting system any way you wish.  Elimination method will likely be most comfortable, at least part-way through.  Divide members of the one performance equation by 5 to simplify.  If you then multiply both members of the "combined cost" equation by 5, you will be able to subtract one equation from the other to eliminate y, and continue to get a value for x.