Question

Which distance formula shows a direct variation? 1. D=50t 2. D=16t^2 3. D= r×t

Answer 1

The answer could be choice 1 or 3. 

With direct variation, we simply multiply one variable to get the other variable.

In #1, we are multiplying t by 50.

In #3, we are multiplying t by r.

In both cases, t is just be multiplied by a number.