Let y be the value (in thousands of dollars) of a car when it is x years old. Some pairs of values of x and y are listed in the table. Find an equation that describes the relationship between x and y. Age (years), x 0 1 Value (thousands of dollars), y 17 13 2 9 3 5 4 1 The equation that describes the relationship between x and y is y = (Do not factor.)