X and y vary directly. When x is 24, y is 8. What is x when y is 9? Algebra Graphs of Linear Equations and Functions Direct Variation 1 Answer Shwetank Mauria Dec 11, 2016 #x=27# Explanation: As #x# and #y# vary directly then #xpropy# i.e. #x=ky#, where #k# is a constant. When #x=24#, #y=8# i.e. #24=k×8# and therefore #k=24/8=3# and relation between #x# and #y# is hence #x=3y# and when #y=9#, #x=3×9=27#. 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 2773 views around the world You can reuse this answer Creative Commons License