Solving Systems Algebraically, quick check

5. A group of 45 people attended a ballgame. There were twice as many children as adults in the group. Set up a system of equations that represents the number of adults and children who attended the game and solve the system to find the number of children who were in the group.

A. 15 adults, 30 children

2. Solve the system using elimination. 2x+6y=-12 5x-5y=10

B. (0,-2)

3. What is the solution of the following system? -3x-2y=-12 9x+6y=-9

B. No solutions

1. Solve the system by substitution. 2x+y=-11 3x-4y=11

C. (-3,-5)

4. What is the solution of the following system? x-y=11 -x+y=-11

C. Infinitely many solutions