Ch. 3: Forecasting Given the following demand data: Time Period Demand 7 years ago 6 years ago 5 years ago 4 years ago 3 years ago 2 years ago Last year 7 28 21 42 35 56 49 4. Using the linear trend equation: a. What is b," the slope? [7] b. What is a," the y-intercept? [6] What is the trend line equation? [y = 6 + 7t] d. What are this year's and next year's forecasts? [62, 69] c. {Please note: If you are not getting the right answers for a and b", check to see if, when you set up your columns, you numbered the periods so that the oldest time period is "1" and the most recent period is the largest number, in this case, "7"}