x + y = 9          x + y = 3

1.

2y - 3x = 12         2y - x = 8

2.

y - x = -4          y + x = -4

3.

y - 4x = 8          x + 2 = 0

4.

-2x + 3y = -24          4x - 6y = 48

5.

Your class of 27 students is having a party and you are responsible for bringing drinks. You have to buy two different kinds so you decide on coke and fruit juice. Coke costs $0.75/can and fruit juice costs $0.50/can.You only have $17.00 to spend on the drinks. How many of each should you buy?

1.