# Pre-Cal/Matrices/System of Equations

• Feb 19th 2013, 03:33 PM
MariaBlood777
Pre-Cal/Matrices/System of Equations
A bank teller is counting the total amount of money in a cash register at the end of the day. There is a total of \$2600 in denominations of \$1, \$5, \$10 and \$20 dollar bills.

The total number of paper bills is \$235. The number of twenty dollar bills is twice the number of \$1 dollar bills and the number of \$5 dollar bills is ten more than the number of \$1 dollar bills. What is the system of equations to repersent the situation. Then use matrices to find the number of bills for each denomination.

I seriously dont know where to begin here.

Thank you
• Feb 19th 2013, 03:42 PM
MathJack
Re: Pre-Cal/Matrices/System of Equations
I think you mean that there is a total of 235 bills
• Feb 19th 2013, 03:45 PM
MathJack
Re: Pre-Cal/Matrices/System of Equations
A + b + c + d = 235
d = 2a
a + 10 = b
• Feb 19th 2013, 03:51 PM
MathJack
Re: Pre-Cal/Matrices/System of Equations
a + 5b + 10c + 20d = 2600
• Feb 19th 2013, 04:28 PM
MariaBlood777
Re: Pre-Cal/Matrices/System of Equations
What does the b stand for in a+10=b? and how would I create a matrix out of this equation?