1. The problem asks how to describe the correlation between two points on a graph. 2. Correlation measures the strength and direction of a linear relationship between two variables. 3. If the points lie close to a straight line with a positive slope, the correlation is positive, meaning as one variable increases, the other also increases. 4. If the points lie close to a straight line with a negative slope, the correlation is negative, meaning as one variable increases, the other decreases. 5. If the points are scattered without any clear pattern, the correlation is near zero, indicating no linear relationship. 6. The correlation coefficient $r$ quantifies this relationship, where $r$ ranges from $-1$ (perfect negative correlation) to $1$ (perfect positive correlation), and $0$ means no correlation. 7. To describe correlation between two points, observe their relative positions and the slope of the line connecting them: upward slope indicates positive correlation, downward slope indicates negative correlation, and no slope or random scatter indicates no correlation.