Questions on Algebra: Quadratic Equation answered by real tutors!

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Question 151645: The equation V=-2000t+20,000 describes the value in dollars of a certain model of car after it is T years old. If a car is worth $12,000 into the equation to find the age of the car.: The equation V=-2000t+20,000 describes the value in dollars of a certain model of car after it is T years old. If a car is worth $12,000 into the equation to find the age of the car.
Answer by jim_thompson5910(9421) About Me  (Show Source):
You can put this solution on YOUR website!
V=-2000t+20000 Start with the given equation.


12000=-2000t+20000 Plug in V=12000.


12000-20000=-2000t+cross(20000-20000) Subtract 20,000 from both sides.


-8000=-2000t Subtract


(-8000)/(-2000)=cross((-2000)/(-2000))t Divide both sides by -2,000.


4=t Divide


So the answer is t=4 which means that car is 4 years old.