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May 6th, 2017, 05:45 AM  #1 
Senior Member Joined: Nov 2015 From: hyderabad Posts: 230 Thanks: 2  Solve the Linear Equations
I tried to solve the equations in different ways but unsuccessful. Kindly someone solve this : If $a, b, c$ and $d$ satisfy the equations $a + 7b + 3c + 5d = 16$ $8a + 4b + 6c + 2d = −16$ $2a + 6b + 4c + 8d = 16$ $5a + 3b + 7c + d = −16$ Then $ (a + d)(b + c)$ equals to ? Thank you in Advance!!! 
May 6th, 2017, 06:05 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 18,841 Thanks: 1564 
The equations are satisfied by a = c = 2, b = d = 2.

May 6th, 2017, 06:08 AM  #3 
Senior Member Joined: Nov 2015 From: hyderabad Posts: 230 Thanks: 2  
May 6th, 2017, 06:09 AM  #4 
Senior Member Joined: Nov 2015 From: hyderabad Posts: 230 Thanks: 2  
May 6th, 2017, 08:28 AM  #5 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 12,088 Thanks: 795  

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equations, linear, solve 
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