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HELP PLEASE

 Dec 16, 2020
 #1
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729x + 731y = 1508   (1)

725x + 727y = 1500   (2)

 

Subtract (2) from (1)

4x + 4y = 8  or  x + y = 2  so y = 2 - x;

 

725*x + 727*(2 - x) = 1500

 

727*2 - 2x = 1500

2x  = 727*2 - 1500

x = -23

y = 2 - (-23) = 25

 

x - y = -23 -25 = -48

 

Edited to correct silly mistake!

 Dec 16, 2020
edited by Alan  Dec 16, 2020
 #2
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xxxxxxxxxx

 Dec 16, 2020
edited by Guest  Dec 16, 2020

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