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nagdy1

  • 3 years ago

Write an equation in point-slope form of the line through point J(4, 1) with slope –4.

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  1. AriPotta
    • 3 years ago
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    do you know what point-slope form is?

  2. nagdy1
    • 3 years ago
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    yes

  3. AriPotta
    • 3 years ago
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    so this should be easy. just substitute the numbers in

  4. nagdy1
    • 3 years ago
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    how

  5. nagdy1
    • 3 years ago
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    give u hard time

  6. nagdy1
    • 3 years ago
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    sorry

  7. nagdy1
    • 3 years ago
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    :(

  8. AriPotta
    • 3 years ago
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    tell me what point-slope form is.

  9. nagdy1
    • 3 years ago
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    tells a difference between two points on a line.

  10. AriPotta
    • 3 years ago
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    what?

  11. nagdy1
    • 3 years ago
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    The point-slope form expresses the fact that the difference in the y coordinate between two points on a line (that is, y − y1) is proportional to the difference in the x coordinate (that is, x − x1). The proportionality constant is m (the slope of the line).

  12. AriPotta
    • 3 years ago
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    it's y - y1 = m(x - x1) idk if that's what you meant...

  13. AriPotta
    • 3 years ago
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    brb i gotta walk mah dog

  14. nagdy1
    • 3 years ago
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    at night

  15. nagdy1
    • 3 years ago
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    im at USA

  16. AriPotta
    • 3 years ago
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    alright i'm back

  17. AriPotta
    • 3 years ago
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    so it should be easy. you're just substituting the y in the coordinate for y1, the x in the coordinate for x1, and -4 for m

  18. nagdy1
    • 3 years ago
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    so the answer is y - y1 = m(x - x1)

  19. AriPotta
    • 3 years ago
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    no, you didn't substitute

  20. AriPotta
    • 3 years ago
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    our point is (4,1) so x1 is 4 and y1 is 1

  21. nagdy1
    • 3 years ago
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    y - y1 = m(x - x1) y – 1 = (-4)(x – 4) y - 1 = -4(x - 4) y - 1 = -4x + 16 y = -4x + 16 + 1 y = -4x + 17

  22. AriPotta
    • 3 years ago
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    which one is it then?

  23. nagdy1
    • 3 years ago
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    y = -4x + 17

  24. nagdy1
    • 3 years ago
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    STEp by STEp y - y1 = m(x - x1) y – 1 = (-4)(x – 4) y - 1 = -4(x - 4) y - 1 = -4x + 16 y = -4x + 16 + 1 y = -4x + 17

  25. AriPotta
    • 3 years ago
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    i thought the answer was supposed to be in point-slope form

  26. nagdy1
    • 3 years ago
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    so how can i write y = -4x + 17 to point-slope form

  27. AriPotta
    • 3 years ago
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    lol. it was already in point-slope in step 1. y - 1 = -4(x - 4)

  28. nagdy1
    • 3 years ago
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    haha never knew that

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