I’m not a mathematician but if I recall correctly slope is defined the change in y over the change in x. In your formula solved for x, m would represent the inversion of that, the change in x over the change in y.
yup, slope intercept is the name of the formula. m is the slope of the line and b is still the y intercept.
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That’s just 1 year’s sales. If the TV lasts 5 years it’s raking in 5 times the data. 190M x 5 = 950M/year, and 5 seems conservative.