Algebra 1 unit8

Question

7) You have a total of 21 billi all of which ate either $5 bills or $10 billis, The total value is $170. How many of each type of bill do you have? Write and solve à system of equ ations to solve the problem

Answer 1

let f = # of fivers and t be # of tenners.

 

f+t = 21

5f + 10t = 170

 

There's the system; solve (hint: substitution would work, but any method is OK with me).  show your work and CHECK YOUR ANSWERS.