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Equations of lines in the coordinate plane

1. What is the slope of the line passing through the points (2, 7) and (-1, 3)
 
A. 2/7
B. 3/4
C. 4/3
D. 1/3
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2 Answers

Hi Anon;
Great question.  You should be proud to ask it!
slope=(y-y1)/(x-x1)
It is the change of y, divided by the change of x.  It is also called rise (up and down) over run (left and right).
slope=(3-7)/(-1-2)
slope=-4/-3=4/3
A negative divided by a negative yields a positive number.
The answer is C.
In my classroom, we use the stack and subtract method.
 
 (2 , 7)
-(-1, 3)
 (3 , 4)
 
Then take the second number over the first since slope is rise over run.
 
4
3
 
The Correct answer is C.