A highway department is studying the relationship between traffic flow and speed. The following model has been hypothesized.

A highway department is studying the relationship between traffic flow and speed. The following model has been hypothesized. y = 0 + 1 x + 2 x 2 + where y = traffic flow in vehicles per hour x = vehicle speed in miles per hour The following data were collected during rush hour for six highways leading out of the city. Traffic Flow (y) Vehicle Speed (x) 1,257 36 1,329 45 1,226 35 1,335 45 1,349 50 1,124 25 Enter negative values as negative, if necessary.