Use Linear Models to Solve Problems Practice Test

A meteorologist developed a linear model $$y = -0.65x + 85$$ to predict humidity percentage ($$y$$) based on altitude in hundreds of feet ($$x$$). According to this model, at what altitude would the predicted humidity be 72%?

A fitness trainer tracks the relationship between weekly exercise hours and weight loss for clients. The equation $$y = 1.8x + 0.5$$ models this relationship, where $$x$$ represents hours of exercise per week and $$y$$ represents pounds lost per week. What does the y-intercept of 0.5 most likely represent in this context?