The slope of the line is 1 and the y-intercept is 0. Therefore, the equation of the line is y = x.
The slope of the line is equal to the rise over run of any two points on the line. From the graph, we can choose the points (-5, -5) and (5, 5).
Slope =

The y-intercept is the point where the line crosses the y-axis, which is (0, 0)
Therefore, the equation of the line in slope-intercept form is:
y = 1x + 0
or simply
y = x