<PRE><B>Question 699451</B>
Kelley has a total of $6 in dimes and quarters. If she has a total of 30 coins, how many quarters does she have? 
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Equations:
d + q = 30
10d+25q = 600
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Rearrange for graphing:
d = -q + 30
d = (-5/2)q + 60
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{{{graph(400,400,-10,50,-10,70,-x+30, (-5/2)x+60)}}}
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Cheers,
Stan H.</PRE>