Question

2. Which equation is the direct linear variation equation for the relationship? y varies directly with x and y = 10 when x = 2 A. y = x + 8 B. y = 5x C. y = x - 8

Answer 1

Direct linear variation means y = kx where k is a constant 
Inverse variation means y = k/x 
For the first question y = kx 
We are told y = 10 when x = 2 
Therefore 10 = 2k  k= 5 
which is 5x not x-8