When the county fair opened its gates,  68 people  entered the fairgrounds. after one hour, there were  1.5 times  as many people on the fairgrounds as when the gates opened. after two hours, there were  1.5 times  as many people on the fairgrounds as the previous hour. if this pattern continues, write the equation representing the number of  people,  y,  at the fair  x  hours  after the gates open.