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(-x, - y, = -8, x + 3y, = 16)

Guest Feb 16, 2017
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-x - y = -8       →    x + y  = 8    →   y  = 8 - x     (1)

x + 3y  = 16       (2)

 

Sub  (1)  into (2) 

 

x + 3( 8 - x )   =  16

 

x + 24 - 3x  = 16

 

-2x  + 24  = 16      subtract  24 from both sides

 

-2x = -8    divide by -2

 

x  = 4

 

And using (1)  ...... y  = 8 - x   →  y  = 8 - 4   y   =  4

 

So  { x, y }   =  { 4 , 4 }

 

 

cool cool cool  

CPhill  Feb 16, 2017

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