Value = $43,500 - 3,625x models the decreasing value of the car over 12 years until it reaches $0.
The straight-line depreciation equation can be expressed using;
Depreciation = Initial value - Final value/Number of years
Where,
Initial value = $43,500
Final value = 0 because it depreciates totally
Number of years = 12 years
So, Depreciation = 43,500 - 0/12
Depreciation = 43,500/12
Depreciation = 3625
The depreciation per year is $3,625.
To express the depreciation equation:
Value = Initial Value - (Depreciation per year * Number of years)
Value = 43,500 - (3,625 * x)
Value = $43,500 - 3,625x
So, this equation (Value = $43,500 - 3,625x) models the decreasing value of the car over 12 years until it reaches $0.