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Having a brain fart.


ak78

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I know the answer, and I got the right answer, but I simply forgot some of the algebra that would allow me to get there. Can someone detailedly go through the algebra of this problem? I get the combining like terms part, and also get up to the part of getting a(b+c) + d(b+c) = 6. It's the just rest that where I get kind of hazy. And I'm writing this from memory, so I'm not quite sure if statement is really supposed to equal 6 or not. But I'm guessing that the actual numerical doesn't matter so much.

 

 

 

What is the value of b+c?

(1) ab+cd+ac+bd = 6

 

(2) a + d = 4

 

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