Consider the following linear model: y = a+1

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Consider the following linear model:

y = a+1.3x

This linear model forecasts total book sales in units (in 1,000s) given the total amount of pre- order sales (in $1,000) identified by variable x. Calculate the value of the intercept (y-intercept) given that if the amount of pre-order sales is $2000 then the predicted sales volume is y 7800 units. (Hint: notice that both and y are expressed in 1000 units in the regression model).