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Find $ a+ b$ when: \[ 2009a + 2008b = 2007\]\[ 2008a + 2009b = 7002\]

 Feb 22, 2021
 #1
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Subtracct second  equation from the  first

 

a - b = - 4995        a = -4995 + b

 

 2009 ( -4995+b) + 2008 b  = 2007

 

 

        2008 b + 2009 b = 10036962

            b = 2498.621

  then a =   -2496.379

 Feb 22, 2021
edited by ElectricPavlov  Feb 22, 2021
edited by ElectricPavlov  Feb 22, 2021

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