I need help with these equations

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Article #156

#156

From: Bill
Date: Fri, 06 Oct 2006 15:35

22 lines
1717 bytes

Considering the following table ...

  a   | b   | c  | d
---------------------
  256 | 80  | 4  | 0
  704 | 80  | 11 | 7
  288 | 512 | 0  | 5
  736 | 512 | 7  | 12

Given a pair of values for a and b, I derived the following to solve for 
c and d ...

c = ( ( a - 256 ) / 64 ) - ( ( b - 464 ) / 96 )
d = ( ( a - 256 ) / 64 ) + ( ( b - 80 ) / 96 )

But given a pair of values for c and d, I am having difficulty finding a 
and b. I came up with the following but it is incorrect. any help would 
be appreciated, thank you.

a = ( ( c * 64 ) + 256 ) + ( ( d * 96 ) + 464 )
b = ( ( c * 64 ) + 256 ) - ( ( d * 96 ) + 80 )

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Date: Fri, 06 Oct 2006 11:35:00 -0400