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a textbook store sold a combined total of 348 history and chemistry text in week.The number of history textbooks sold was three times the number of chemistry books were sold. how many book of each type were sold.

Respuesta :

Answer:

x=87, y=261

Step-by-step explanation:

x+y=348 and 3x=y

plug 3x in for y.  

x+(3x)=348

4x=348

x=87

plug x in to solve for y.

3(87)=y

y=261

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