The slope of a line remains constant no matter which two points you use to calculate it. This is a fundamental property of linear equations. In mathematical terms, the slope (m) is calculated using the formula:
\[ m = \frac{y_2 - y_1}{x_2 - x_1} \]
where \((x_1, y_1)\) and \((x_2, y_2)\) are any two different points on the line. Since the formula gives the same result for any pair of points on the line, the slope is indeed constant.