Question

For which would you draw a dashed boundary line a d shade to the left?

a) x⩽ -4
b) x ⩾ -4
c) x < -4
d) x > -4​

Answer 1

a) x⩽ -4

Explanation:

This is because the required region is anything to the left of -4 that is x < -4. Now since x = -4 is inclusive, we have the inequality x ≤ -4.

We thus draw a dashed boundary line to represent the equality at the boundary for x ≤ -4.

Since that is done, we then shade to the left of the boundary line which is the required region of x ≤ -4.