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0
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What are a, b, and c?

 Jul 21, 2020
 #1
avatar+1038 
+10

Hmm... To me, this looks like maybe homework? Instead of giving you the answer, here are some hints:

Add the last two equations together, what do you get?

 Jul 21, 2020
 #2
avatar+28021 
+1

From the second equation   b = a+7    sub this into the third equation ...then solve for  'a'

   use this value of 'a'   in equation 2 or three to find  'b'   

      then use the values of 'a' and 'b'  in equation 1  to find 'c'

 Jul 21, 2020
edited by ElectricPavlov  Jul 21, 2020

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