
Concept explainers
The first three row operations introduced in this section can be used to put most matrices into a form called reduced row echelon form. (This is the form that most computer programs use to solve systems of equations.) The reduced row echelon form for the matrix in Try This One 4 is
- (a) Explain why the reduced row echelon form is helpful in solving systems.
- (b) Use the first three row operations from this section to transform the original augmented matrix for Tiy This One 4 into the matrix to the left. (Hint: First, get the first column to look like the one in the matrix to the left. Then get a 1 in the second row second column and proceed from there.)
▼ Try This One 4
Solve the system using Gaussian elimination:

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Chapter 7 Solutions
Math in Our World
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