To solve equation systems, rearrange equation terms to have only one variable on equation left side {substitution, equation}. In second equation containing that variable, substitute first-equation right side for variable, to eliminate variable from second equation. This is an example of replacing whole by sum of its parts.
Mathematical Sciences>Algebra>Equation>System>Solution
3-Algebra-Equation-System-Solution
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0224