A machine can make 56 parts in 4 hours. It can also make in . Which rates could you use to write an equation of the form ykx that represents the number of parts y the machine can make in ​? What is that​ equation? Question content area bottom Part 1 Which of these rates could you use to write an equation of the form ykx that represents the number of parts y the machine can make in ​? Select all that apply.