Answer:
Step 3, because the solution should also include all the values for x between the two given values
Step-by-step explanation:
step 1
we have
[tex]y_1=\left|x-4\right|[/tex]
[tex]y2=1[/tex]
step 2
The graph in the given problem
step 3
Identify the solution when [tex]y1\leq y2[/tex]
so
[tex]\left|x-4\right|\le1[/tex]
using a graphing tool
The solution is the interval -----> [3,5]
see the attached figure
All real numbers greater than or equal to 3 and less than or equal to 5
therefore
The first step in which the student made an error is step 3