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tonipoo610

  • 2 years ago

how do you identify a slope on a coordinate graph?

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  1. blurbendy
    • 2 years ago
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    You take two points on the line made by the slope. Then calculate the slope by taking (Y2 - Y1) / (X2 - X1) The slope is the ratio between the difference in the two y points and the difference in the two x points.

  2. tonipoo610
    • 2 years ago
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    so on my homework it says rise: -5 and run:-5

  3. tonipoo610
    • 2 years ago
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    i dont understand what that means i am only in 7th grade lol

  4. blurbendy
    • 2 years ago
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    You know when you look at the coordinate graph you have numbers on the x-axis and numbers on the y-axis?

  5. tonipoo610
    • 2 years ago
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    yes

  6. blurbendy
    • 2 years ago
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    Okay, on the x-axis, move over 5 "spaces", then go up 10 "spaces"

  7. tonipoo610
    • 2 years ago
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    but why ten because the rise is-5 and the run is -5

  8. blurbendy
    • 2 years ago
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    Yes, but we need to different points in order to calculate the slope of a line.

  9. blurbendy
    • 2 years ago
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    So now we have (5, 10) and (-5,-5) okay?

  10. blurbendy
    • 2 years ago
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    two*

  11. tonipoo610
    • 2 years ago
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    ok

  12. blurbendy
    • 2 years ago
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    Y2 - Y1 / X2 - X1 just means this: Take the SECOND y-point from (5, 10) and (-5, -5) which is -5 and subtract it from the FIRST y-point from (5, 10) and (-5, -5) which is 10

  13. blurbendy
    • 2 years ago
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    so we end up with -5 - 10 = -15 Do you follow so far?

  14. tonipoo610
    • 2 years ago
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    i do but i don't understand how you got 5 and 10 from

  15. blurbendy
    • 2 years ago
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    It's just a point I made up so that we can take the slope of a LINE (you need two points in order to do this). I'll come back to your question in a second (it will make sense trust me :) )

  16. tonipoo610
    • 2 years ago
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    yeah i get this but on my homework i just don't know where to get the other pairs cuz it doesn't tell

  17. blurbendy
    • 2 years ago
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    Oh, I see.

  18. blurbendy
    • 2 years ago
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    So it just says rise = -5, and run = -5?

  19. blurbendy
    • 2 years ago
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    They got those numbers from doing what we're doing Y2 - Y1 / X2 - X1. It looks like that is already solved for you!

  20. blurbendy
    • 2 years ago
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    So that means we have -5 / -5

  21. blurbendy
    • 2 years ago
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    and the slope is the ratio of RISE / RUN

  22. blurbendy
    • 2 years ago
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    So the slope = 1 !!! Understand?

  23. tonipoo610
    • 2 years ago
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    ohhhhh thxxxxx

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