Answer:
y = x - 5
Explanation:
Note that when x increases from zero (0) to 5, an increase of 5 units, y increases from -5 to 0, an increase of 5 units.
Thus, the slope of this line is m = rise / run = 5/5 = 1.
The y-intercept is clearly discernable and is (0, -5).
Thus, using the slope-intercept form of the equation of a straight line:
y = 1x - 5, or just y = x - 5.