A waiter earned $23 in tips in an hour. He was paid in $1 bills and $5 bills. Use a model to determine how many $5 bills he received if he received a total of 15 bills.
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We have a little system of equations here
let x represent the number of 1 dollar bills and 'y' represent the number of 5 dollar bills
we know they got 15 bills total so
x + y = 15
now we also know they earned 23 dollars total...so using the value of the money TIMES how much they got....we have
1x + 5y = 23
so how can we solve that system of equations?
x + y =15
1x + 5y = 23
good explaining @johnweldon1993 .....you couldn't have explained it any simpler :)