The calculated slope of the line using the triangle is -1/2
How to determine the slope of the line
From the question, we have the following parameters that can be used in our computation:
The triangles
The slope of the line using the triangle can be calculated using
Slope = Rise/Run
Where, we have
Rise = 2
Run = -4
Substitute the known values into the equation
Slope = 2/-4
Evaluate
Slope = -1/2
Hence, the value of the slope is -1/2