What equation models the data in the table if d = number of days and c = cost? Days Cost 2 6 3 9 5 15 6 18 c = 3d c = d + 3d d = 3c c = d + 3

After looking at the table I believe the equation would be c=3d. I came to this conclusion because (6)=3(2); (9)=3(3); (15)=3(5); 18=3(6). I really hope this helps!:)