Answer:
y= -1/3x-3
Explanation:
The slope is -1/3 because the equation is rise/run. The rise is 1, and the run, or horizontal length, is 3. Because the line is slanting toward the left, the slope will be negative.
y=mx+b is the equation for a linear line.
y= -1/3x+b (substitute the slope in)
choose any point on the line, for example, (0,-3).
-3= -1/3(0)+b (0 is the x, and -3 is the y)
b= -3
Your equation will be y= -1/3x-3