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Here are the problems that I didnt figure out.

1)The owner of a movie theater was counting the money from 1 day's ticket sales. He knew that a total of 150 tickets were sold. Adult tickets cost 7.5 each and children's tickets cost 4.75 each. If the total receipts for the day were 891.25, how many of each kind of ticket were sold?

2) Solve the following system of equations algebraically.

y = x^2 + 2x - 1

y = 3x + 5

I have no clue about this, we did it like 2 years ago.

Oh and if you can show the work, much obliged. BTW she said we're allowed to get help since this is a take home packet.