Sharon has some one dollar bills and som five dollar bills . she has 14 bills . the value of the bills are $30. solve a system of equations using elimination to find how many of each kind of bill she has

Let the no. of one dollar bills be x and the no. of five dollar bills be y.

She has 14 bills = > 1st equation => x+y=14
The value of the bills are $30 = > 2st equation =>  ($1)x + ($5)y = 30

Simultaneous equations : 
x + y = 14 => x = 14 - y
x + 5y = 30 

Sub x = 14 - y into x + 5y = 30 ,
ie. (14 - y) + 5y = 30   =>  14 +4y = 30  => 4y = 16  => y=4

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