The y intercept value can also be found by using the equation = - b

The y intercept value α can also be found by using the equation
α = - b
Verify this result by using the data in Exercises 15 and 16 of Sections 10€“1 and 10€“2.
Exercise 15:
The director of an alumni association for a small college wants to determine whether there is any type of relationship between the amount of an alumnus€™s contribution (in dollars) and the years the alumnus has been out of school. The data follow.
Years and contribution data are as follows:

Exercise 16:
An economics student wishes to see if there is a relationship between the amount of state debt per capita and the amount of tax per capita at the state level. Based on the following data, can she or he conclude that per capita state debt and per capita state taxes are related? Both amounts are in dollars and represent five randomly selected states.
Data for per capita state debt and per capita state tax are as follows:

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1 53 10 7 6 Years r Contribution y, S 500 100 300 50 75 80 Per capita deb1924 907 1445 1608 661 Per capita t 1685 1838 1734 1842 1317