The number of five- and ten-dollar bills that Salim has are; 6 and 3
How to solve simultaneous equations?
We are given two equations;
x + y = 9 - - - - (eq 1)
5x + 10y = 60 - - - (eq 2)
Where;
x represents the number of five-dollar bills.
y represents the number of ten-dollar bills.
Making x the subject in eq 1 gives;
x = 9 - y
Put 9 - y for x in eq 2 to get;
5(9 - y) + 10y = 60
45 - 5y + 10y = 60
5y + 45 = 60
5y = 60 - 45
5y = 15
y = 15/5
y = 3
Thus;
x = 9 - 3
x = 6
Read more about simultaneous equations at; https://brainly.com/question/16863577
