For 26
a) We could first rotate clockwise 90 degrees from the origin, and then reflect on the x axis.
b) We could rotate counterclockwise 90 degrees and then reflect on the y axis.
For 27
a) Rotate counterclockwise 90 degrees from the origin, then translate down 1
b) Reflect on x axis, rotate 90 degrees clockwise, then reflect on x axis, translate down 1, left 1
These are just a couple of the possible ways to solve this, try to figure out some more for yourself!