N+4-9 - 5n when simplifying

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.

I’m still confused on how to work the percentages

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x