What is the direct variation equation if y varies directly with x, and #y=7.5# when #x=2.5#? Algebra Graphs of Linear Equations and Functions Direct Variation 1 Answer seph Nov 1, 2014 #y = kx# #=> 7.5 = k(2.5)# #=> 7.5 = 2.5k# #=> k = 3# #=> y = 3x# 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=2# when #x=4#? What is the constant "k" in #y=-\frac{2}{3}x#? See all questions in Direct Variation Impact of this question 7848 views around the world You can reuse this answer Creative Commons License