Which pair of numbers is relatively prime?

a.
26 and 91

b.
14 and 63

c.
18 and 45

d.
10 and 33

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )