Your friend Pat says to you, "I'm on a new diet plan and I've been able to lose about a pound a week." Come up with a linear equation that models this situation and use it to answer the following questions:

If Pat currently weighs 210 pounds, how much would Pat weigh in a year (52 weeks)?

________ Pounds

Assuming Pat stays on this plan and the equation is still valid, how much would Pat weigh in 4 years?

________ Pounds

Does this equation still seem like it would be valid after 4 years?