A passenger rode the subway 2 blocks west and then 10 blocks south. If all the blocks are the same length, what is the value of the slope of the line from where the passenger began to where he finished?

Let east be the positive x-direction and north be the positive y-direction. The passenger’s displacement is 2 blocks west and 10 blocks south, so the changes are −2 horizontally and −10 vertically. The slope is change in y divided by change in x: (−10)/(−2) = 5. The slope is 5, choice B.

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