Question 375761
let $1 bill be x
$10 bill will be 55-x
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1*x+10(55-x)=100
x+550-10x=100
-9x+550=100
-550      -550
-9x=100-550
-9x=-450
/-9
x=-450/-9
x= 50 .... $1 bills
y = 5 $10 bills
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m.ananth@ hotmail.ca
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you can also solve by a linear system
x+y =55
x+10y=100
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multiply first equation by -1
-x-y=-55
add it to second equation
9y = 45
/9
y =5 ... $10 bills
x = $1 bills
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