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NotSoSmart  Dec 21, 2017
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 #1
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+1

2.5x - 3y  = -13     (1)

3.25x - y  =  -14  ⇒    y  =  3.25x + 14     (2)

 

Sub (2) into (1)  and we have

 

2.5x - 3 [ 3.25x + 14]   = -13     simplify

 

2.5x - 9.75x - 42  =  -13    

 

-7.25x  - 42  = -13       add 2 to both sides

 

-7.25x =  29               divide both sides by -7.25

 

x  =  -4

 

And using  (2), y  =  3.25(-4)  + 14   =  -13  + 14  = 1

 

So  {x, y}   =  { -4, 1 }

 

 

cool cool cool

CPhill  Dec 21, 2017

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