*OC*and

*OD*.

*OA*,

*OB*, and

*DC*all have negative slopes. If you've got a good eye for slopes, you've got a good feeling about (E) right now, because

*OA*looks way too steep, and

*OB*looks way too gradual. It's a good idea to confirm though, so let's put the points into the slope formula just to be sure.

*DC*goes between points (1, 3) and (3, 1). So our slope is:

Yep, (E) is our answer.

Note that we can use this same formula to find the slopes of all the segments for practice, or just for fun (hah!): Slope of

*OA*= -3, slope of*OB*= -1/3, slope of*OC*= 1/3, slope of*OD*= 3.
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