boundary line	a line that represents the edge of a linear inequality: if points along the boundary line are included in the solution set, then a solid line is used; if points along the boundary line are not included in the solution set, then a dashed line is used
bounded region	the set of solutions that are true for all of the linear inequalities under consideration
elimination method	a method of solving a system of equations by adding or subtracting equations in order to eliminate a common variable
half-plane	on a coordinate plane, the shape of the region of possible solutions generated by a single inequality
rate	a mathematical way of relating two quantities, which usually are measured in different units
substitution method	a method of solving a system of equations by substituting one quantity in for an equivalent quantity
system of equations	a set of two or more equations that share two or more unknowns
system of inequalities	a set of two or more inequalities that must hold true at the same time