SOLUTION: PLEASE help me with this question! Thank you SO much! : ) Large pies cost $7, and small pies cost $4. If 20 pies were sold for $122, how many small pies were sold?

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Question 206317This question is from textbook Algeba I: An Incremental Development
: PLEASE help me with this question! Thank you SO much! : )
Large pies cost $7, and small pies cost $4. If 20 pies were sold for $122, how many small pies were sold? This question is from textbook Algeba I: An Incremental Development

Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
L+S=20 so L=20-S
7L+4S=122
7(20-S)+4S=122
140-7S+4S=122
-3S=-18
S=6
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L+6=20
L=14
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14*7+6*4=122