System of equations - word problems

There are 15 animals in a barn.  These animals are horses and chickens.  There are 44 legs in all.  Which system of equations represents the situation?

• x + y = 15
  4x + 2y = 44
• 4x + 2y = 15
  x + y = 44
• x = 2y + 44
  4x = y + 15
• 2x - 4y = 44
  x - y = 15

Nancy went to the grocery story.  On Monday she purchased 4 apples and 6 bananas for a total of $13.  On Wednesday she purchased 3 apples and 7 bananas for a total of $13.50.  Which system of equations represents the situation?

• 4x + 6y = 3
  13.5x - 13y = 6
• x + y = 4
  x - y = 6
• 4x + 6y = 13
  3x + 7y = 13.5
• 4x - 6y = 13
  3x - 7y = 13.5

Select ALL possible equations for the problem:

Matt bought 6 pens and 4 notebooks for $8.

Chance bought 5 pens and 8 notebooks for $9.

• 6p+4n=8

• M=6p+4n

• C=5p+8n

• 5p+8n=9

Select ALL possible equations for the problem:

Tom and Ryan are brothers. The sum of their ages are 49. Tom is 5 years older than Ryan.

• T+R=49

• T=5+R

• T=R-5

• R=5+10

Solve for y:
2x + 2y = 6

• y = - x + 3
• y = x + 3
• y = 2x +6
• y = - 2x + 6

How many solutions will this system have? 

• No solution
• One Solution
• I Don't Know
• Infinitely Many Solutions

Erin is 3 years younger than twice Alex's age. Their ages combined are 33 years. How old are Alex and Erin. If x=Erin's age and y=Alex's age, choose the system that matches the situation.

• x + y = 33
  y = 2x - 3
• x + y = 33
  x = 2y - 3
• x + y = 33
  x = 3 - 2y
• x + y = 3
  x = 33 - 2y

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Jerry went to the store to buy chips and sodas. Each bag of chips cost $2.50 and each soda costs $1. Jerry bought 15 items for a total $27. How many bags of chips did Jerry buy?