Find the least-squares regression line yˆ=b0+b1x through the points

1. Find the least-squares regression line yˆ=b0+b1x through the points
(−1,1),(3,6),(6,14),(9,20),(9,23).
For what value of x is yˆ=0?
x = 

2.Find the least-squares regression line yˆ=b0+b1x through the points
(−1,2),(2,7),(4,13),(8,18),(11,26),
and then use it to find point estimates yˆ corresponding to x=4 and x=6.
For x=4, yˆ = 

For x=6, yˆ =