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
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
