Answer
Given matrix $A$, if one row of $A$ is multiplied by $k$ to produce $B$, then $det$ $B$ = $k$ $* det$ $A$.
Work Step by Step
Given matrix $A$, if one row of $A$ is multiplied by $k$ to produce $B$, then $det$ $B$ = $k$ $* det$ $A$.
In this case, the first row of the matrix on the right was multiplied by 3 to reach the matrix the left. Thus, the determinant of the matrix on the left is three times the determinant of the matrix on the right.
