What is a system of linear equations in three variables?

What is a system of linear equations in three variables?
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SchulzD
The set of equations that involved representing a line.
The system of equations suggest three unknown values for which those equations are need to be solved.
The system of linear equations in 3 variables is a set of 3 linear equations with 3 unknown values called variables.
For example,
2x+4y+7z=1x+3y+5z=−12−x+3y−3z=16