Final answer:
The original question about pivoting an augmented matrix cannot be fully answered without the specific matrix or system of linear equations. Pivoting a matrix is a step in Gaussian elimination, important for solving linear systems, but the provided context suggests a physics problem related to equilibrium, not a mathematical matrix operation.
Step-by-step explanation:
The question asks about performing a pivot operation on the augmented matrix of a system of equations, specifically pivoting about the element in row 1, column 1. To pivot a matrix, we typically divide the pivot row by the pivot element to make the pivot element 1. Then, we manipulate the other rows with row operations so that all elements in the pivot column, except for the pivot element itself, are zeros. This is part of the process of Gaussian elimination, which is used to solve systems of linear equations. However, based on the information provided, without an actual system of linear equations or a matrix, we cannot perform the requested operation or provide a step-by-step explanation. It seems like the pivot operation described is more related to equilibrium in physics problems, considering the references to center of mass, choosing a pivot at the rear axle, and free-body diagrams, which are not consistent with the original question about an augmented matrix.