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Can someone help me solve...

  4x+9y=7

  4x-9y=9

 

Using the combination method?

Guest Mar 7, 2017

Best Answer 

 #1
avatar+12561 
+10

Sure !   Just add the two equations together to get:

8x =16     x = 2

 

4(2) -9y = 9

8--9y = 9

-9y=1

y = -1/9

ElectricPavlov  Mar 7, 2017
 #1
avatar+12561 
+10
Best Answer

Sure !   Just add the two equations together to get:

8x =16     x = 2

 

4(2) -9y = 9

8--9y = 9

-9y=1

y = -1/9

ElectricPavlov  Mar 7, 2017

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