We can express the slope of a line as the ratio between the variation in y, in the vertical axis, and the variation in x, in the horizontal axis.
We can use any pair of points in the line to calculate the slope.
If we use the pair of points that form the smaller triangle, we get:
We can also see that the bigger triangle will give a slope of m = 8/4 = 2, an equivalent result as expected.
Then, we can write the slope as 4/2, 8/4 and 2.
The only value that does not correspond to the slope of this line is 1/2.
Answer: 1/2 [Option 3]