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28 November, 06:43

The equation v=-2000+20000 describes the value in dollars of a certain model of car after it is t years old. If a car is worth $10,000, substitute 10,000 into the equation to find the age of the car.

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  1. 28 November, 07:01
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    I'm assuming the equation is:

    v = - 2000t + 20,000 because the value of a car decreases with time

    v = worth of the car

    t = number of years

    Since you know the value of v = 10,000, substitute or plug in 10,000 for v in order to find t

    v = - 2000t + 20,000 Substitute 10,000 into v [To find t, you need to get the variable by itself to one side of the equation.]

    10,000 = - 2000t + 20,000 Subtract 20,000 on both sides

    -10,000 = - 2000t Divide - 2000 on both sides to get t by itself [negative divided by a negative results in a positive]

    5 = t
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