The sample solution in GT1 has a row operation of the form $R_2\to-3R_2$, i.e., it has the transformed row on the right. This has led to some confusion about whether we are multiplying by $-3$ or $-1/3$. This issues seems to have been resolved already in the CheckIt bank but not the sample soluion.
The sample solution in GT1 has a row operation of the form $R_2\to-3R_2$, i.e., it has the transformed row on the right. This has led to some confusion about whether we are multiplying by $-3$ or $-1/3$. This issues seems to have been resolved already in the CheckIt bank but not the sample soluion.