The value of p varies with q, and p=8 when q=2. What is the value of p when q=7?

Question

I need help with my math problem. I don't understand it

Answer 1

 

The base equation for direct variation ...

 

    p = k•q   where j is the constant of variation.

 

We use the given values of p and q to solve for k.

 

    8 = k•2

    4 = k     the constant of variation is 4

 

The equation is

 

    p = 4q

 

When q = 7, we plug q in and solve for q

 

    p = 4(7)

 

    p = 28