Question #7b5bc Algebra 1 Answer turksvids Jan 15, 2018 See explanation. Explanation: Given that #D(x)=2x#: #D(x)# is definitely a function since each input generates exactly one output. So that's true. #x# is the independent variable since you pick an #x# and it determines #D(x)#. #D(6)= 2*6=12# so #D(6) ne 3#. #D(x)# is a direct variation since if we let #D(x)=y# then #y=2x# which is direct variation with constant #k=2# All of the points in the set #{(5,10), (6,12), (-2,-4)}# definitely fit the rule #y=2x#, so this one is true. Answer link Related questions How do I determine the molecular shape of a molecule? What is the lewis structure for co2? What is the lewis structure for hcn? How is vsepr used to classify molecules? What are the units used for the ideal gas law? How does Charle's law relate to breathing? What is the ideal gas law constant? How do you calculate the ideal gas law constant? How do you find density in the ideal gas law? Does ideal gas law apply to liquids? Impact of this question 722 views around the world You can reuse this answer Creative Commons License