Hello Terrence, and welcome to Seven Forums.
This should help with that. The descriptions in each tutorial below will give more details on the function of the two to be able to see the difference better.
"Create a system image" = Create a complete clone of selected hard drives as a backup
Backup Complete Computer - Create an Image Backup
and
"Create a system repair disc" = Disc is used to boot from to boot into the
System Recovery Options screen to attempt to repair Windows 7 with one the available option.
System Repair Disc - Create
Hope this helps,
Shawn
EDIT:
LOL, Rich beat me.