Assume that when plotting a graph, price (in dollars per pie) is on the y-axis and quantity (in pies per week) is on the x-axis. When plotting the points, when the y-value is 1, the x-value is 8, when the y-value is 2, the x-value is 7, when the y-value is 3, the x-value is 6, when the y-value is 4, the x-value is 5, when the y-value is 5, the x-value is 4, and when the y-value is 6, the x-value is 3. (Enter your responses as whole numbers.) Part 4 The line that best fits the data has a positive slope . Part 5 c. Calculate the slope of the line. Slopeequals enter your response here (Enter your response as a whole number. Be sure to include a minus sign if necessary.)