State the practical meaning of the slope and y-intercept for the situation described. The value, in dollars, of a particular KX37B computer is given by V = -412.48x + 6843, where x is the number of years the computer has been in existence.

a. -412.48 signifies the amount of depreciation in one year, and 6843 signifies the initial cost.
c. -412.48 signifies the hourly cost of repairs, and 6843 signifies the cost of software.
b. -412.48 signifies the number of computers owned, and 6843 signifies the cost of electricity.
d. 6843 signifies the amount of depreciation in one year, and -412.48 signifies the initial cost.

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