Ms. Thompson has six one-dollar bills, fifteen five-dollar bills, and nine ten-dollar bills. Let the variables x,y, and z be the denominations of one, five, and ten bills, respectively. You can solve the values of the denominations through the following equations and with the use of substitution and elimination techniques:
a. y=x+z
b. x+y+z=30
c. x+5y+10z=171
