The slope-intercept form of a line is:
y = mx + b
where m is the slope and b is the y-intercept
The slope of the line that passes through the points (x1, y1) and (x2, y2) is computed as follows:

From the graph, the line passes through the points (0, 8) and (3, 3), then its slope is:

From the graph, the line intersects the y-axis at (0,8), then b = 8.
Finally, the equation is:
