### Home > PC3 > Chapter 9 > Lesson 9.2.2 > Problem 9-117

9-117.

MATRIX DEFINITIONS, REVIEWED

Write the

and identity matrices. Recall that an identity matrix has

s on the diagonal from upper left to lower right and s elsewhere. State the dimensions of each of the following matrices:

In part (

*i*) above, identifyand.means the entry in the second row, first column.