What is the direct variation equation if y varies directly with x, and y=2 when x=4? Algebra Graphs of Linear Equations and Functions Direct Variation 1 Answer seph Oct 29, 2014 y varies directly with x => y = kx if x = 4, then y = 2 => 2 = k(4) #=> 4k = 2 => k = 1/2 => y =1/2x Answer link Related questions What is Direct Variation? What does direct variation look like on a graph? What are examples of direct variation? How do you determine if a function is a direct variation when given a table? How do you write direct variation equations? What is the constant of proportionality "k"? Why is y=2x-1 not a direct variation? How do you graph the direct variation equation y=-\frac{1}{6}x? What is the direct variation equation if y varies directly with x, and y=7.5 when x=2.5? What is the constant "k" in y=-\frac{2}{3}x? See all questions in Direct Variation Impact of this question 8459 views around the world You can reuse this answer Creative Commons License