given the varibles of the question z=mx+my+b. x=artspend Arts and culture spending in the last month , range 0-200. y=art_overall_score total number of all arts activities (including Other) engaged as "one off" or more frequently (not never) numerical, range 0-20. z=mhcscore Mental Health Continuum SF score; the sum of mhchedonic, mhcsocialw, and mhcpsycholw numerical, range 0-70. What does the slope of 0.064353444x mean? and 0.216464494y mean