Compare the values of the 5 in 552,299 use numbers or words to solve

Hillel is juggling flaming torches to raise money for charity. his initial appearance raises $500\$500 $500 , and he raises $15\$15 $15 for each minute of juggling performance. the amount rr r of money hillel raises is a function of tt t , the length of his performance in minutes. write the function's formula.

Witch represents the inverse of the function f(x)=1/4x-12

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827