Given the system of linear equation : 

When using back-substitution to solve the “triangular” system of linear equations:

In order for the matrix  to be the inverse of , both equations and must be true.   (i.e. it is not enough that is the left inverse of , to be truly an inverse, it must be both its left inverse and its right inverse.)

Which of the following are linear equations?

If and are invertible square matrices , then the inverse of is

If we have to interchange row 1 and row 3 of a

If and are invertible square matrices , then theinverse of is

The length of a pulse does not directly influence the temporal resolution.

A digital representation of a number can achieve only specific fixed values.

Postprocessing of image data occurs after the data has been stored in the scan converter.