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Please give examples of linear systems which (1) has 4 variables and 2 equations. (2) has...

Please give examples of linear systems which

(1) has 4 variables and 2 equations.

(2) has 4 variables and 2 equations and is inconsistent.

(3) has 4 variables and 2 equations and has exactly one solution.

(4) has 4 variables and 2 equations and has infinite many solutions

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