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To find the slope of the line using similar triangles, we can choose any two points on the line and calculate the rise over run ratio.
Let's choose points (-3,1) and (0,0) from the given points.
The rise is the difference in y-coordinates: 1 - 0 = 1.
The run is the difference in x-coordinates: -3 - 0 = -3.
So, the slope of the line is rise / run = 1 / -3 = -1/3.