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Thank you for your help.

Guest Sep 20, 2018
 #1
avatar+92674 
+1

A. Two equations - Two Unknowns...we can solve by the elimination method

 

B. Let x be the price of the hardcover book and y be the price of the paperback...and we have

 

4x + 10y =  64

5x + 7y = 58

 

C.  Multiply the top equation through by  5 and the bottom equation through by  -4 and we get

 

20x  + 50y  = 320

-20x - 28y =  -232      add these

 

22y  =   88    divide both sides by 22

y =  4   ⇒  cost of paperback in dollars

 

And using 4x + 10y  = 64, the cost of the hardback can be found as

 

4x + 10(4)   = 64

4x + 40  = 64   subtract 40 from both sides

4x  = 24   divide both sides by 4

x  = 6  ⇒ cost of hardback in dollars

 

 

 

cool cool cool

CPhill  Sep 20, 2018

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