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Dixie Showtime Movie Theaters, Inc. owns and operates a chain of cinemas in several markets in the southern United States. The owners would like to estimate weekly gross revenue as a function of advertising expenditures. Data for a sample of eight markets for a recent week follow. $($Let x$1$ represent Television Advertising $($$$100$s$),$ x$2$ represent Newspaper Advertising $($$$100$s$),$ and y represent Weekly Gross Revenue $($$$100$s$).)$

Market Weekly Gross Revenue $($$$100$s$)$ Television Advertising $($$$100$s$)$ Newspaper Advertising $($$$100$s$)$

Market $1101\mathrm{.}34\mathrm{.}91\mathrm{.}6$

Market $251\mathrm{.}92\mathrm{.}92\mathrm{.}9$

Market $374\mathrm{.}84\mathrm{.}11\mathrm{.}4$

Market $4126\mathrm{.}24\mathrm{.}44\mathrm{.}2$

Market $5137\mathrm{.}83\mathrm{.}73\mathrm{.}9$

Market $6101\mathrm{.}43\mathrm{.}62\mathrm{.}4$

Market $7237\mathrm{.}85\mathrm{.}18\mathrm{.}3$

Market $8219\mathrm{.}66\mathrm{.}85\mathrm{.}9$