If y varies directly with x, and If y = 2.5 when x = 0.5, how do you find y when x = 20? Algebra Graphs of Linear Equations and Functions Direct Variation 1 Answer Binayaka C. Apr 20, 2016 When # x=20; y=100# Explanation: #y prop x :. y = k*x or k =y/x = 2.5/0.5=5# (k is proportionality costant) When #x=20 ; y =5*20=100# [Ans] 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 direct variation equation if y varies directly with x, and #y=2# when #x=4#? See all questions in Direct Variation Impact of this question 8429 views around the world You can reuse this answer Creative Commons License