A meeting room is available for rent. Last month, four groups held meetings there. The number of members per group and the per-member cost for each group is shown below. Number of Members in the Group (x) Per-Member Cost for the Meeting Room (y)
10 6
15 4
20 3
30 2
Which function equation would represent this situation?

y = x/60
y = 60/x
y = x + 60
y = x – 60