Question

Use the Gauss-Jordan method with pivoting to find the inverse of the coefficient matrix for the system of equations given. Hint: Keep values as fractions rather than estimating using decimal points throughout. When reporting your answer, convert to decimal form.

Approximately halfway through calculating the inverse, just before multiplying Row 3 by a scalar so that A(3,3) becomes 1, what is the value of A(3,3)? Answer is 0.1

On the last calculation, just before multiplying Row 1 by a scalar so that A(1,2) becomes 0, what is the value of A(1,2)? Answer is 0.5

A=[-1 2 0; 4 2 1; 0.5 -2 0]
b= [-1; -9; 2]

Answer 1