Coach Keller is having the last names of his players printed on their shirts. The lettering company charges a flat fee and a charge per letter. The table shows the total costs for 15, 20, 25, and 30 letters. Select the correct values to model the situation with a linear function. 1 2 3 4 Numbe Number of Letters, x 15 20 25 30 0.25 7 15 Cost (S), y 7 8.25 9.5 10.75 1 8.25 20 3.25 9.5 30 slope: = y-intercept: +b; b = linear function: y = xt What do the slope and y-intercept of the function represent?