Questions $5$ through $8$ use the datasheet named HousingPrice, representing the monthly average housing price $($in $$1,000$s$)$ in the DFW metropolitan area from $2000$ to $2003.$

$5.$ Use the additive seasonal technique for stationary data to model the data. Use Solver to determine the optimal values of $$ and $.$

a$.$ What are the optimal values of $$ and $?$

b$.$ Prepare a line graph comparing the predictions from this method against the original data.

c$.$ Using this technique, what are the forecasts for each of the next six months?