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Identifying the slope of a line

  • Thread starter Kirito123
  • Start date
  • #1
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Homework Statement


identifying the slope of the line?[/B]
upload_2016-4-20_12-45-28.png


Homework Equations


y2-y1/x2-x1

The Attempt at a Solution


i chose two points on the line, the first point is (8,-3) and the second point is (-6,4). Are these points accurate?
i used the slope equation to solve for the slope of the line from the graph:
4-(-3) / -6-8 = -7/14 = -1/2

is this right?





 

Answers and Replies

  • #2
BvU
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Well done. One tip: use brackets -- not 4-(-3) / -6-8 but ( 4-(-3) ) / ( -6-8 )
 
  • #3
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can the answer also be 7/-14 and 1/-2
 
  • #4
Ray Vickson
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Homework Statement


identifying the slope of the line?[/B]
View attachment 99414

Homework Equations


y2-y1/x2-x1

The Attempt at a Solution


i chose two points on the line, the first point is (8,-3) and the second point is (-6,4). Are these points accurate?
i used the slope equation to solve for the slope of the line from the graph:
4-(-3) / -6-8 = -7/14 = -1/2

is this right?


What you wrote means ##y_2 - \frac{y_1}{x_2} - x_2##, which is not correct. Did you mean ##\frac{y_2 - y_1}{x_2 - x_1}##? If so, you need to use parentheses, like this: (y2-y1)/(x2-x1).
 
  • #5
BvU
Science Advisor
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2019 Award
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Both of these are the same value as ##-{1\over 2}##, which is the simplest way to express that value. Whatever points you choose, you always get ## - {a\over 2a}## as a result.
 
  • #6
125
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got it, thanks!
 
  • #7
963
213
i chose two points on the line, the first point is (8,-3) and the second point is (-6,4). Are these points accurate?
i used the slope equation to solve for the slope of the line from the graph:
4-(-3) / -6-8 = -7/14 = -1/2

is this right?
its a straight line ,so where lies the confusion about its being wrong?
 
  • #8
125
14
i solved this question previously and got a different slope compared to what I'm getting now. Then i realized that my points were wrong when doing it the first time, so i wanted to make sure the points i chose were correct in my second attempt.
 

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