I need a math guru to explain why and how the elimination method of solving simultaneous equations works ?(adsbygoogle = window.adsbygoogle || []).push({});

why do we add or subtract the two equations ?(I undertand in order to eradicate either term) but I need to know from the basics .

For that matter, how/why does the substitution method work ?

thanks

Roger

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Gaussian elimination

**Physics Forums | Science Articles, Homework Help, Discussion**