Graph the equations to solve the system y equals 1/3 x +6 and why equals 1/3 x +4

For this case we have the following functions:
 y = (1/3) x + 6
 y = (1/3) x + 4
 We note that both lines have the same slope in this case given by:
 m = 1/3
 Therefore, the lines are parallel. As they are parallel, they are not cut at any point.
 Thus, the system of equations has no solution.
 
 The system has no solution (parallel lines)

In all honesty, there really is no “work” per say to show. mainly it’s just using the process of elimination. the question is asking which domain(s) would be the most appropriate for the function c(n). n is the number of observed vehicles so right away, 1, 2, and 3 can be eliminated.why? 1, 2 start in the negatives and therefore it is impossible to observe negative cars. so, #4 would be the best answer to the given problem.

Iknow one of the answers is a and maybe b but not 100% sure about b