You have just opened a new nightclub, Russ' Techno Pitstop, but are unsure of how high to set the cover charge (entrance fee). One week you charged $9 per guest and averaged 165 guests per night. The next week you charged $13 per guest and averaged 105 guests per night. (a) Find a linear demand equation showing the number of guests q per night as a function of the cover charge p.