What is the slope of the line? a) -2 b) -1/2 c) 1/2 d) 2

The slope of a line is rise over run, which is the change in y over the change in x. Here, the change in y over the change in x would simplify to (3-2)/(2-4). It does not matter what point you choose to put as the first value, but if you put that point as the first value for x, you have to do the same for y. This equation simplifies to our answer of a slope of 1/2 or 0.5 

B is the answer because the slope is negative and the line is 1-2 so -1/2