Elementary and Intermediate Algebra

Mark Dugopolski, Southeastern Louisiana University

Systems of Linear Equations and Inequalities

Determinants and Cramer's Rule

Warm-Ups


1
		A)	TRUE
		B)	FALSE


2
		A)	TRUE
		B)	FALSE


3	Cramer’s rule solves any system of two linear equations in two variables.
		A)	TRUE
		B)	FALSE


4	The determinant of a 2 x 2 matrix is a real number.
		A)	TRUE
		B)	FALSE


5	If D = 0, then there might be no solution to the system.
		A)	TRUE
		B)	FALSE


6	Cramer’s rule is used to solve systems of linear equations only.
		A)	TRUE
		B)	FALSE


7	If the graphs of a pair of linear equations intersect at exactly one point, then this point can be found by using Cramer’s rule.
		A)	TRUE
		B)	FALSE


8	The determinant of a 3 x 3 matrix is found by using minors.
		A)	TRUE
		B)	FALSE


9	Expansion by minors about any row or any column gives the same value for the determinant of a 3 x 3 matrix.
		A)	TRUE
		B)	FALSE


10	The sign array is used in evaluating the determinant of a 3 x 3 matrix.
		A)	TRUE
		B)	FALSE

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