+0  
 
0
28
1
avatar+761 

Help.

 
NotSoSmart  Oct 10, 2017
social bar
Sort: 

1+0 Answers

 #1
avatar+76837 
+1

 

5x + 4y  =  12     (1)

3x - 3y   =  18      divide through by 3  →  x - y  =  6  ..... 

multiply through by 4 →  4x - 4y  = 24      (2)

 

Add (1)  and (2)

 

9x  =  36       divide through by 9

 

x  = 4

 

Using    x - y  =   6, we have

 

4 - y  = 6        add y to both sides, subtract 6 from both sides

 

4 - 6  = y  =  -2

 

 

cool cool cool

 
CPhill  Oct 10, 2017
edited by CPhill  Oct 10, 2017

21 Online Users

avatar
avatar
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details