TOO +90 Practice 1. Write the linear equation to model each of the following situations: a. A new machine costs $70,000 and has a salvage value of $21,000 after 5 years. Let S = mt+b, where Sis the salvage value and t is the time in years. b. At $450 per person, an airline anticipates selling 350 tickets for a flight. At $500 per person, they anticipate selling 300 tickets. Let C = mx + b, where is the cost per ticket and x is the number of tickets sold