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If $a+b = 8$, $b+c = -3$, and $a+c = -5$, what is the value of the product $abc$?

 Jul 18, 2020
 #1
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a+b =8

    b = 8-a

 

a+c = -5

    c = -5 - a

 

b+c = -3

 substitute  

   8-a   +  -5 -a  = -3

   3 - 2a = -3

      -2a = -6

         a  = 3           you  should be able to continue from here.......

 Jul 18, 2020

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