Data on annual tuition and average mid-career salary of graduates of a certain degree program are collected from a number of universities and colleges. The result of the data collection is the linear model

y
=
0.83
x
+
106
,


where
x
=
annual tuition and
y
=
average mid-career salary of graduates, both in thousands of dollars. This model is accurate for annual tuition values between 10 thousand and 40 thousand dollars.



What is the slope of this linear model?


According to this model, what is the average salary for a graduate of a college or university where the annual tuition is $25,000?
$