| A | B |
| best-fit line | can be drawn through data points to approximate a linear relationship |
| boundary | in a graph of an inequality the line of the related pair |
| direct variation | a linear equation that describes rate of change |
| function | a relation in which each member of the domain is paired with exactly one member of the range |
| half plane | in a graph of an inequality the region that contains all the solutions |
| linear equation | a graph of this is a straight line |
| rate of change | a change in one quantity with respect to another quantity |
| slope | a value that describes the steepness of a line |
| substitution | one type of method for solving systems ofequations |
| system of equations | a group of two or more equations |