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Question

What is the slope of the line joining the points (x1,y1) and (x2,y2)?

A
y1x2x1
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B
y2y1x2x1
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C
y2x1x2
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D
y2x2
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Solution

The correct option is B y2y1x2x1
Slope of a line is defined as the ratio of the rise to the run.

In the figure given, the two points are (x1,y1) and (x2,y2).

As we can see, the rise, which is the change in the y coordinate is y2y1

and, the run, which is the change in the x coordinate is x2x1

Thus,
slope=riserun
=y2y1x2x1

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