The variables x and y vary directly. If x=1/2 and y=6, what is the direct variation equation? A: y=-2x+1
B: y=-2x-1
C: y=2x-1
D: y=2x+1

Randy and trey take turns cleaning offices on the weekends. it takes randy at most 4 hours to clean the offices. it takes trey at most 6 hours to clean the offices. what is the greatest amount of time it would take them to clean the offices together? 2.4 hours 2.5 hours