1. Solve the system: 2x + y = 5 x - y = 13 2. Bobby is three years older than twice Arianna's age. If the total of their ages is 9, how old is Bobby,...

1. Solve the system: 2x + y = 5

                              x - y = 13

2. Bobby is three years older than twice Arianna's age. If the total of their ages is 9, how old is Bobby, and how old is Arianna?

3. Solve the system: y = x2 + 5

                             6x - y = 3