Ineed to determine if this is a function or not

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

Given: hf || jk; hg ? jg prove: fhg ? kjg to prove that the triangles are congruent by asa, which statement and reason could be used as part of the proof? fgh ? kgj because vertical angles are congruent. jkg ? hfg because vertical angles are congruent. fhg ? jkg because right angles are congruent. hfg ? kjg because alternate interior angles are congruent.

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie