Constant of proportionality from a graph point with fractions

The line goes through the origin, so divide the point's y by its x.

1. The graph of a proportional relationship is a straight line through (0, 0) and (6, 48). What is the constant of proportionality?
2. The graph of a proportional relationship is a straight line through (0, 0) and (4, 30). What is the constant of proportionality?
3. The graph of a proportional relationship is a straight line through (0, 0) and (10, 85). What is the constant of proportionality?
4. The graph of a proportional relationship is a straight line through (0, 0) and (14, 112). What is the constant of proportionality?
5. The graph of a proportional relationship is a straight line through (0, 0) and (16, 112). What is the constant of proportionality?
6. The graph of a proportional relationship is a straight line through (0, 0) and (10, 20). What is the constant of proportionality?
7. The graph of a proportional relationship is a straight line through (0, 0) and (16, 80). What is the constant of proportionality?
8. The graph of a proportional relationship is a straight line through (0, 0) and (20, 160). What is the constant of proportionality?
9. The graph of a proportional relationship is a straight line through (0, 0) and (6, 21). What is the constant of proportionality?
10. The graph of a proportional relationship is a straight line through (0, 0) and (18, 117). What is the constant of proportionality?
11. The graph of a proportional relationship is a straight line through (0, 0) and (6, 27). What is the constant of proportionality?
12. The graph of a proportional relationship is a straight line through (0, 0) and (4, 44). What is the constant of proportionality?
13. The graph of a proportional relationship is a straight line through (0, 0) and (8, 64). What is the constant of proportionality?
14. The graph of a proportional relationship is a straight line through (0, 0) and (12, 54). What is the constant of proportionality?
15. The graph of a proportional relationship is a straight line through (0, 0) and (20, 280). What is the constant of proportionality?
16. The graph of a proportional relationship is a straight line through (0, 0) and (12, 108). What is the constant of proportionality?
17. The graph of a proportional relationship is a straight line through (0, 0) and (4, 62). What is the constant of proportionality?
18. The graph of a proportional relationship is a straight line through (0, 0) and (22, 242). What is the constant of proportionality?
19. The graph of a proportional relationship is a straight line through (0, 0) and (40, 200). What is the constant of proportionality?
20. The graph of a proportional relationship is a straight line through (0, 0) and (28, 364). What is the constant of proportionality?