maths is very fun

boundary

a line that marks the limits of an area; a dividing line

closed half-plane

. If the points on the line are included,

compound inequality

an inequality that combines two simple inequalities

half-plane

the area of the coordinate plane that gets divided by a line (known as the boundary line) into two halves

inequality

difference in size, degree, circumstances, etc.; lack of equality

intersection

a point or line common to lines or surfaces that intersect.

Multiplication Property of Inequalities

a set of rules that govern how numbers are multiplied

open half-plane

If the points on the line are not included

set-builder notation

a mathematical notation of describing a set by listing its elements or demonstrating its properties that its members must satisfy

union

the combination of all the elements from two or more sets