The value of almost everything you own (assets), such as a car, computer, or house, depreciates (goes down) over time. When an asset's value decreases by a fixed amount each year, the depreciation is called straight-line depreciation. Suppose your truck has an initial value of $12,400 and depreciates $820 per year. Write an equation that illustrates this function if you plan to keep the truck for 7 years and determine the value of the truck at the end of this period. Let v represent the dependent variable and let t represent the independent variable.