+0  
 
0
68
1
avatar

3x plus 2y equals 8 2x plus 5y equals -2

Guest Mar 21, 2017
Sort: 

1+0 Answers

 #1
avatar+77080 
+1

3x + 2y = 8     multiply through by  2 →   6x + 4y  = 16     (1)

2x + 5y = -2    multiply through by -3 →  -6x - 15y = 6      (2)

 

Add (1)  and (2)  and we get

 

-11y  = 22     divide both sides  by (-11)   and  y  = - 22/11   =  -2

 

Sub this into 3x + 2y  = 8 to find x

 

3x + 2(-2)  = 8

3x - 4  = 8       add 4 to both sides

3x  = 12        divide both sides by 3

x = 4   

 

 

 

cool cool cool

CPhill  Mar 21, 2017

6 Online Users

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