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need help ti solve this

 

 

6x-6y+11=17

9y=3x+15

 

as an order pair

off-topic
 Mar 6, 2019
edited by raziel305  Mar 6, 2019
edited by raziel305  Mar 6, 2019
 #1
avatar+106533 
+2

6x-6y+11=17    ⇒  6x - 6y  =  6    ⇒  x - y  =  1    ⇒   x = 1 + y      (1)

9y=3x+15      (2)

 

Put (1) into (2)  for x

 

9y =  3(1 + y)  + 15       simplify

 

9y  = 3 + 3y + 15

 

6y =  18

 

y =  3

 

And using (1)

 

x = 1 + 3  =  4

 

(x, y) = (4 , 3)

 

 

cool cool cool

 Mar 6, 2019

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