Answer:
x = 6
Step-by-step explanation:
From the given information we can write the equation
DF = DE + EF ( substitute the values for the segments )
9x - 22 = 4x - 1 + 9
9x - 22 = 4x + 8 ( subtract 4x from both sides )
5x - 22 = 8 ( add 22 to both sides )
5x = 30 ( divide both sides by 5 )
x = 6
