Answer:
A
Step-by-step explanation:
MB is a perpendicular bisector to JK, thus triangle is equilateral/ isosceles, hence
MJ = MK
9x - 18 = 3x ( subtract 3x from both sides
6x - 18 = 0 ( add 18 to both sides )
6x = 18 ( divide both sides by 6 )
x = 3 → A
