Linear Functions, Equations, and Inequalities>Writing Linear Functions to Model Data and Make Predictions(TEKS.A.9-12.4.C) Practice Test

Regression analysis of study hours ($x$) vs test scores ($y$) yields the linear model $y = 8.5x + 65$. What test score is predicted for 6 hours of study?

A car's value is modeled by $V = -2800t + 25000$, where $V$ is value in dollars and $t$ is time in years since purchase. According to the model, after how many years will the car be worth 15,000 dollars?