PLEASE HELP!!! ALGEBRA
posted by Jona .
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 represent the situation. Then use matrices to find the number of bills for each denomination.

Did you mean
" the total number of paper bills is 235" , not $235 ?
let the number of $1 bills be x
number of $20 bills = 2x
number of $5 bills = x+10
number of $10 bills = y
x + 2x + x+10 + y = 235
4x + y = 225 (#1)
1(x) + 20(2x) + 5(x+10) + 10y = 2600
x + 40x + 5x + 50 + 10y = 2600
46x + 10y = 2550
23x + 5y = 1275 (#2)
Using matrices ???? , why?
from #1, y = 2254x
sub into 2nd
23x + 5(225x) = 1275
23x + 1125  5x = 1275
18x = 150
x = 150/18 > not a whole number,
something wrong with your question, check your typing 
That is a Algebra Question. EVERYBODY has a problem with this question. Anyway this is a problem I tell everybody, I'm sorry I can not answer