Say you buy a new car in 2010 for $23,000 and depreciates linearly so that in
2015 the car is worth $5000. For this linear depreciation, find the equation (y =
mx + b). Then use that equation to find out what year the car will be worth $0. Go
out two decimal places

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step-by-step explanation:

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step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15