| coordinate plane | A plane formed by the intersection of a horizontal number line called the x-axis and a vertical number line called the y-axis. |
| linear equation | An equation in two variables whose ordered pairs graph as a straight line. |
| linear relationship | A linear relationship exists between two variables if, when you plot their values on a coordinate system, you get a straight line. |
| ordered pair | A pair of numbers that indicates a point on a coordinate plane. |
| x-intercept | The point where the graph of a linear equation intersects the x-axis (x, 0). |
| y-intercept | The point where the graph of a linear equation intersects the y-axis (0, y). |