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x + y = 9

-10x + 6y = 6

 Aug 4, 2017
 #1
avatar+94544 
+1

 

x + y = 9      →       x  =  9 - y      (1)       note......this isolates x

-10x + 6y = 6     (2)

 

Sub (1)  into (2)

 

-10 ( 9 - y) + 6y  = 6     simplify

 

-90 + 10y + 6y  = 6

 

-90 + 16y  = 6      add 90 to both sides

 

16y = 96     divide both sides by  16

 

y  = 6          and using (1),    x =  9 - 6   =   3

 

 

cool cool cool

 Aug 4, 2017

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