Determine if the system is in echelon form, and if so, identify the leading variables and the free variables. If it is not in echelon form, explain why.
Definitions:
Source Area
The specific location from which data is retrieved or imported, often used in the context of spreadsheets or databases.
Custom Fill Sequences
User-defined sequences in spreadsheet programs that automate the process of filling cells with a series of values.
Fill Handle
A feature in spreadsheet programs that allows users to extend a series of values or formulae to adjacent cells.
Sparkline Chart
A tiny chart in a worksheet cell that provides a visual representation of data; used to show trends or patterns in Excel and other data analysis tools.
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