Asked by Because
                the price of a hat is $12.  The price of a scarf is $14.  I spent $128 on 10 items.  How many hats did I buy?
            
            
        Answers
                    Answered by
            Scott
            
    h + s = 10 ... s = 10 - h
12 h + 14 s = 128
substituting
... 12 h + 14(10 - h) = 128
... 12 h + 140 - 14 h = 128
... -2 h = -12
    
12 h + 14 s = 128
substituting
... 12 h + 14(10 - h) = 128
... 12 h + 140 - 14 h = 128
... -2 h = -12
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