The question F=9/5c+32 a proportional relationship

No it's not.

Because it's not in the form of F=kc

Where k is a constant number.

This is not a proportional relationship.

Step-by-step explanation:

A proportional relationship is that one that connects two variables by a constant of proportionality.

This type of relationships can be written as:

X = k*Y

where X and Y are the variables, and k is constant of proportionality.

In our relationship, F=9/5c+32, we can see that we have another term, a 32, so this relation can not be a proportional relationship.