If there is one solution, give its coordinates in the answer spaces below. if there are infinitely many solutions, enter t in the answer blank for x3, enter a formula for x2 in terms of in the answer blank for x2 and enter a formula for x1 in terms of in the answer blank for x1. if there are no solutions, leave the answer blanks for x1, x2 and x3 empty.

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. at the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation s=300-15x , where s is the number of pair of shoes kelly still needs to sell and x is the number of days she has worked that month. what is the meaning of the number 300 in this equation