Make sure that when you bring a number to the other side of the equal sign, you need to change from + to - or from - to +
Suppose that the probabilities of a customer purchasing 0, 1, or 2 books at a book store are 0.20.2, 0.20.2, and 0.60.6, res
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You want the equation for a line that goes through the data points (0, 248) and (5, 277). The slope is ∆y/∆x = (277-248)/(5-0) = 29/5 = 5.8. The first data point is the y-intercept, so your equation in slope-intercept form is
... y = 5.8x + 248 . . . . . . where y is MWh of generation and x is years since 2007.
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∆y is read "delta y". It means "the change in y".
