Answer: The graph is attached.
Explanation:
The region is limited by two lines:
and

You can write the first inequlity
in the following form:

This region are all the values for which the y-axis is less than the line f(x)=x+6 (all the values under the line).
The other inequality x ≤ 4 are all the values for which the x-axis is less than the line x=4 (all the values to the left of the line).
Observe the graphs attached.