1. Peter works as a delivery person for a bike shipping company. The graph shows a linear model for his delivery times on different days. (3,21) X=delivery time in minutes Y=time in days

(a) What is the equation of the line, first written in point-slope form and then written in slope-intercept form? Show how you determined the equation.
(b) Based on the linear model, predict how long it initially took Peter to deliver his packages (y-intercept). Approximately how much did his delivery time decrease per day (slope)? Complete sentences