a.
To explain: how each equation uses the property. A property of determinants is given ( A and B are square matrices). Then use a graphing utility to verify that each equation is true.
a.

Answer to Problem 79E
The statement is verified by graphical utility.
Explanation of Solution
Given information: If Bis obtained from A by interchanging two rows of A or by
interchanging two column of A , then
Calculation:
Column 2 is interchanged with column 3. This operation reverses the sign of determinants ,leaving the magnitude unchanged.
Using graphical utility,
and,
Hence , the statement is verified by graphical utility.
b.
To explain: how each equation uses the property. A property of determinants is given ( A andB are square matrices). Then use a graphing utility to verify that each equation is true.
b.

Answer to Problem 79E
The statement is verified by graphical utility.
Explanation of Solution
Given information: If B is obtained from A by interchanging two rows of A or by
interchanging two column of A , then
Calculation:
Row 1 is interchanged with row 3 .This operation reverses the sign of the determinant keep the magnitude unchanged.
Using graphical utility,
and,
Hence , the statement is verified by graphical utility.
Chapter 7 Solutions
PRECALCULUS W/LIMITS:GRAPH.APPROACH(HS)
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