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If $3+a=4-b$ and $4+b=7+a$, what is $3-a$?

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 Mar 15, 2020
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If $3+a=4-b$ and $4+b=7+a$, what is $3-a$?

 

3+a = 4-b    b= 1-a

7+a= 4+b    b = 3+a

 

1-a = 3+a       a = -1         3 - -1 =4

 Mar 15, 2020

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