Mathematics for IGCSE & O level - Inequalities (Section 1 - No. 2)
What is the purpose of a solid line on an inequality graph?
To indicate the boundary.
To show that the boundary is included.
To show the value is less than or equal to
To show that the value is greater than or equal to
Explication
Solid line will indicate that the value is less than or equal to, or greater than or equal to.