Posted by Mathew on Thursday, January 13, 2011 at 8:34pm.
Mrs. Chans math class contributed 2 dollars and $1 coins to an earthquake relief fund. the number of $1 coins contributed was 8 less than 5 times the number of $2 coins contributed. if class raised total of 160 bucks, how many coins of each type was collected?
it says i have to solve this by the elimination method, and i cant seem to figure out.

Math  PsyDAG, Friday, January 14, 2011 at 11:37am
Let x = number of $1 coins and y = number of $2 coins.
x = 5y  8
x  5y = 8
x + 2y = 160
Multiply first equation by 2 and second by 5.
2x  10y = 16
5x + 10y = 800
Add the two equations.
7x = 784
x = ?
Put value of x in first equation to find y. To check, put both values into the second equation.
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