Answer:
B. 6
Step-by-step explanation:
The picture of the question in the attached figure
we know that
A translation and a reflection are rigid transformations, that produce congruent figures'
Remember that
Two figures are congruent if their corresponding sides and their corresponding angles are congruent
In this problem
Triangle JKL and Triangle J'K'L' are congruent
so
[tex]JL=J'L'[/tex]
substitute the given values
[tex]8=2x-4[/tex]
solve for x
[tex]2x=8+4\\2x=12\\x=6[/tex]
