Which equation repesents a direct proportion?

Step-by-step explanation:

In mathematics, a direct proportion is defined as

Where is a constant of proportionality.

One way to describe this proportionality is to say that "if we increase one variable, the other one will also increase", "if we decrease one variable, the other one will also decrease".

But, in this case, the right answer is the one that has the same form as the defintion .

Therefore, the right anwer is C.

Where the constant is 5.

the answer is 99.

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