Finding Average Salary Based on a Linear Regression Function

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The problem: Data on tuition and mid-career salary are collected from a number of universities and colleges. The result of the data collection is the linear regression model𝒇(𝒙)=−𝟎.𝟖𝟗𝒙+𝟏𝟔𝟒where x=annual tuition and f(x)=average mid-career salary of graduates, both in thousands of dollars.According to this model, what is the average salary for a graduate of a college or university where the annual tuition is $72,000? What is the slope of this regression model?

The solution: $99,920 -0.89 or $-890 ... https://www.youtube.com/watch?v=z2fk_zZnFOo