Please help, due today.. any guesses?!

If the graphs of the linear equations in a system are parallel, what does that mean about the possible solution(s) of the system? a. there are infinitely many solutions. b. there is no solution. c. there is exactly one solution. d. the lines in a system cannot be parallel.

How do you determine if an ordered pair is a solution to a given equation?

Pls the last one and it has to be like number 6