math help please.... solutions and answers, need to see if I am right.. thanks?

Question

1. solve by sub method
x-y+3
3x-2y=4
2.2x-y=4
2x-y=3
3.x+3y=2
-x+y=1
4. Donna invested her $33,000 bonus and received a total of $970 in interest after one year. If part of the money returned 4% and the remainder 2.25% then how much did she invest at each rate?
5. Tickets for a concert were sold to adults for $3 and students for $2. If the total receipts were $824 and twice as many adults tickets as student tickets were sold then how many of each were sold?
6. add method x+y =13
22x +36y = 356

7. -3x+2y=8
3x+2y =8
8. 3/7x+5/9y=27
1/9x+2/7x = 7

9. 2y-3=3
x=3y-5

10. At gwens garage sale, all books were one price and all magazines were another. Harriet bought 4 bookds and 3 mags for 1.45, and june bought 2 books and 5 mags for 1.25. what was the prie of a book and what as the price of a mag?

Answer 1

Are you trying to get us to do your homework for you, tricky.

Answer 2

1. solve by sub method
x-y=3 =>y=x-3
3x-2y=4 => 3x-2(x-3)=4
x +6 = 4 => x = -2, y=-5


2.2x-y=4 => y = x-4
2x-y=3 => 2x -x + 4 = 3
x = -1 => y = -5

3.x+3y=2
-x+y=1 => x = y-1
y-1+3y = 2 => 4y = 3 => y =3/4
x=-1/4

Answer 3

Edit your question to include your answers, and we'll look to see if you're right.