Question 969526
use the given matrix to perform the operation 3R3 and select the correct option 
1 -2 1
1  0 4
1 -2 5
<pre>
3R3 just means to multiply the 3rd row (the bottom row), "R3", by 3:

1 -2  1
1  0  4
3 -6 15 

Edwin</pre>