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May 6th, 2017, 06:45 AM   #1
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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!!!
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May 6th, 2017, 07:05 AM   #2
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The equations are satisfied by a = c = -2, b = d = 2.
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May 6th, 2017, 07:08 AM   #3
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Quote:
Originally Posted by skipjack View Post
The equations are satisfied by a = c = -2, b = d = 2.
I want to know how to solve these... Please let me know the steps.
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May 6th, 2017, 07:09 AM   #4
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Quote:
Originally Posted by skipjack View Post
The equations are satisfied by a = c = -2, b = d = 2.
I got $ b$ value as $ 2$ but after that where to put this value to get another variable value ?
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May 6th, 2017, 09:28 AM   #5
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Quote:
Originally Posted by Lalitha183 View Post
I want to know how to solve these... Please let me know the steps.
Google "solving 4 unknowns with 4 equations"

Can't teach from here...no blackboard
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