Simultaneous equation

In algebra,If a set of linear functions describe a single situation, then it is called as a set of simultaneous equations.

Solving high grade simultaneous equation by elimination method:

A set of simultaneous equations can be solved by different methods - Substitution method, Elimination method, Matrix method, Determinant method and Graphical method.

You can also see the link on How to Graph Set of Linear Functions or Simultaneous Equations

Let us take an example of solving simultaneous equation by elimination method:

Solve the following simultaneous equations by using the elimination method:

Solution:

Label the equations as follows:

Notice that 3y appears on the left-hand side of both equations.  Adding the left-hand side of (1) and (2), and then the right-hand sides, gives: