Perform R1←R1−R2R_1 \leftarrow R_1 - R_2R1←R1−R2 on (5522)\begin{pmatrix} 5 & 5 \\ 2 & 2 \end{pmatrix}(5252). What is the new first row?
[3,3][3, 3][3,3]
[5,5][5, 5][5,5]
[0,0][0, 0][0,0]
[7,7][7, 7][7,7]