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9x + 1/2y = 51 7x + 1/3y = 39 use the elimination method

 Jan 21, 2017
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9x + 1/2y = 51   →  18x + y = 102    →  -18x -  y = - 102    (1)

7x + 1/3y = 39   →  21x + y = 117    →   21x + y =    117    (2)

 

Add (1) to (2)  and we have

 

3x  = 15    →   x  = 5

 

So

 

18(5)  + y  =  102

 

90 + y  = 102        →  y  = 12

 

 

 

cool cool cool

 Jan 21, 2017

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