Mark Gershon, owner of a musical instrument distributorship, thinks that demand for guitars may be related to the number of television appearances by the popular group Maroon $5$ during the previous month. Gershon has collected the data shown in the following table:

$\backslash$table$[[$Maroon $5$ TV Appearances,$3,4,6,5,8,5],[$Demand for Guitars,$3,6,6,5,9,8]]$

This exercise contains only parts $b,c,$ and $d.$

b$)$ Using the least$-$squares regression method, the equation for forecasting is $($round your responses to four decimal places$)$:

$Y=+x$