A hamburger costs twice as much as a hot dog. Three hamburgers and two hot dogs cost $21. Choose the system of linear equations that represents this problem.

A. 2y=x
2x+3y=21

B. y=2x
2x+3y=21

C. x=2y
3x+2y=21

D. y=2x
3x+2y=21

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.

The first one is 2/3the second is 1/160the third is 4/125