How to determine the slope of a line using slope triangle

The video tutorial explains how to determine the slope of a line by identifying two points on a graph. Initially, only one point is known, and the need for a second point is emphasized. The teacher guides students to find the second point at (5, 2) on the graph. Using these two points, the slope is calculated as the ratio of vertical change to horizontal change, resulting in a slope of 2/5.

What does the graph indicate about the intersection of the line with the grid marks?

Describe how the slope is calculated using the points mentioned in the text.