Using a proportional relationship, the total cost of all the pizzas ordered is given by:
6c + 10f.
The question is incomplete, and researching it on a search engine, we find the it asks the total cost of all the pizzas ordered.
A proportional relationship is a function in which the output variable is given by the input variable multiplied by a constant of proportionality, that is:
y = kx
In which k is the constant of proportionality.
In this problem, the cost is a function of two variables, considering the price of each pizza:
Hence the total cost of all the pizzas ordered is given by:
6c + 10f.
More can be learned about proportional relationships at https://brainly.com/question/10424180
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