Step 1 : Become the super user
Step 2 : make a directory where you want to mount the image file e.g. cd /mnt
Step 3 : mount the iso file as: mount -o loop filename.iso /mnt/dir
A loop device is a pseudo-device that makes a file accessible as a block device. Loop devices are often used for CD ISO images and floppy disc images. Mounting a file containing a filesystem via such a loop mount makes the files within that filesystem accessible. They appear in the mount point directory using above commands.
whoa your done ! congrats you've just mounted an iso file in linux without any extra software!