Based on the data shown below, a statistician calculates a linear model x y 1 22.75 23 18.16 15.87 4 14.28 5 6 11.39 10 y= 2.45x+23.97 Use the model to estimate the y-value when = 1. Round the solution to two decimal places, if necessary. y= Use the model to estimate the y-value when a = 4. Round the solution to two decimal places, if necessary. y=