Answer:
y = -2x - 4
Explanation:
y = mx +b is the slope intercept form of a line. The m is the slope and the b is the y intercept.
The y intercept is where the line crosses the y axis. It crosses at the point (0,-4). The -4 is where the line crosses the y axis. It is the b.
The slope is the change in y over the change in x. To go from point (0,-4) to the point (-2,0) You go up 4 units and the left 2 units. Up is positive and left is negative. 4/-2 which simplifies to -2. This is your m.