You can tell by inspection that the slope of this line is positive. As x increases from 0 to 1, y increases from -2 to 1. Thus, the slope of this line is m = 3/1 = 3.
The y-intercept is (0,-2).
Thus, the equation of the line is y = 3x - 2.
Since the area UNDER the line is shaded, the inequality in question is
y ≤ 3x - 2.