Plot the image of point A under a reflection across line
l.

Answer:
Just from point a go 8 spaces to the left and place the dot over there.
Step-by-step explanation:
Since you are getting a reflection of a you need to move 4 spaces to the left of the line to get an exact mirror of point a or relfelction.
To plot the reflected point of A under a reflection across line l, just move 8 units across the line "l" horizontally.
The reflected point of A should be written as A'.