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MaeganR

  • 3 years ago

Write an equation in point-slope form of the line through the given points. Then write the equation in slope-intercept form. #11. (4,0), (-2,1) #12. (-3,-2), (5,3) #13. (-5,1), (3,4) Thats all they give you. And YES I do know the Formulas: Point-slope: y-y1=m(x-x1) Slope-intercept: y=mx+b Slope: m=y2-y1/x2-x1

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  1. chihiroasleaf
    • 3 years ago
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    first.., find the slope using the third formula that you write.., then use point-slope formula to find the equation..

  2. Butterfly16
    • 3 years ago
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    m=y2-y1/x2-x1 (4, 0) (-2, 1) m=1-0/-2-4 m=1/-6 m=y2-y1/x2-x1 (-3, -2), (5, 3) m=3-(-2)/5-(-3) m=5/8 m=y2-y1/x2-x1 (-5, 1) (3, 4) m=4-1/3-(-5) m=3/8

  3. MaeganR
    • 3 years ago
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    SLOPE= -0.16

  4. MaeganR
    • 3 years ago
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    @Butterfly16 Thats what I've done before, but then people come along, and tell me I'm wrong! ):

  5. MaeganR
    • 3 years ago
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    And why are you finding the slope 3 times?

  6. chihiroasleaf
    • 3 years ago
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    because you have three questions and each question have equation... :)

  7. MaeganR
    • 3 years ago
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    oh, well I'm on #11.

  8. Butterfly16
    • 3 years ago
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    y-y1=m(x-x1) (4,0), (-2,1) y-0=(1/-6)(x-4) y-0= -0.16x+0.7 y=-0.16x+0.7 Yeah, I just finding the slope for all of them. :o)

  9. MaeganR
    • 3 years ago
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    Im so freaking confused.

  10. chihiroasleaf
    • 3 years ago
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    now.., using the similar way.., you can solve questions #12 and #13 can you? :)

  11. Butterfly16
    • 3 years ago
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    y1 and x1 just stand for the points. So (4, 0) is the point, so y1 is 0 and x1 is 4. That would the equation for the point-slope form for that set of points.

  12. MaeganR
    • 3 years ago
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    but you have to write it in point-slope form?!

  13. Butterfly16
    • 3 years ago
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    Then, I guess you can just plug in the numbers into the point-slope form so it'd just be: y-0=(1/-6)(x-4)

  14. MaeganR
    • 3 years ago
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    but don't you have to do 2 equations because of (4,0) and (-2,1)

  15. chihiroasleaf
    • 3 years ago
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    @Butterfly16 has write it in slope-intercept form slope-intercept form is y = mx+ c , No.., points (4,0) and (-2,1) are on the same line.., so just choose one of them..

  16. MaeganR
    • 3 years ago
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    |dw:1358115682620:dw|

  17. MaeganR
    • 3 years ago
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    because like that?

  18. Butterfly16
    • 3 years ago
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    Yip, the line would look like that. :o)

  19. MaeganR
    • 3 years ago
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    |dw:1358115910689:dw|

  20. chihiroasleaf
    • 3 years ago
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    yup.., it's for the second line... :)

  21. Butterfly16
    • 3 years ago
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    Awesome job! :o)

  22. MaeganR
    • 3 years ago
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    y-y1=m(x-x1) y--2=1/2(x--3) help

  23. Butterfly16
    • 3 years ago
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    The points for number 12?

  24. MaeganR
    • 3 years ago
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    @erdog82 Kinda.

  25. MaeganR
    • 3 years ago
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    #12. i got that far but I'm stuck now.

  26. Butterfly16
    • 3 years ago
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    y-y1=m(x-x1) (-3, -2) (5, 3) y-(-2)=(5/8)(x-(-3)) y+2=0.625x-1.875 y=0.625x-3.875

  27. MaeganR
    • 3 years ago
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    but y=mx+b

  28. Butterfly16
    • 3 years ago
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    Yup, so for #12 it'd be y=0.625x-3.875

  29. MaeganR
    • 3 years ago
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    but thats y=mx-b it should be y=mx+b though right?

  30. erdog82
    • 3 years ago
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    why are you guys using decimals? fractions are easier

  31. erdog82
    • 3 years ago
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    no, it depends, if you are adding a negative, its the same as subtracting, and its okay @MaeganR

  32. MaeganR
    • 3 years ago
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    Can someone show mw how you get #13 now?

  33. erdog82
    • 3 years ago
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    ok

  34. erdog82
    • 3 years ago
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    4-1/ 3--5 (or 3+5) so what is that?

  35. MaeganR
    • 3 years ago
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    |dw:1358116987370:dw|

  36. MaeganR
    • 3 years ago
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    And @erdog82 what are you doing?

  37. erdog82
    • 3 years ago
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    how do you get from y-1= 3/8 x--5 to y=mx +b form?

  38. erdog82
    • 3 years ago
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    its as simple as adding 1 number

  39. MaeganR
    • 3 years ago
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    idk. I was trying to do it like @Butterfly16 was doing it.

  40. erdog82
    • 3 years ago
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    oh and its y-1=3/8 x+5

  41. erdog82
    • 3 years ago
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    so you add 1 to 5 and you get..

  42. MaeganR
    • 3 years ago
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    6

  43. MaeganR
    • 3 years ago
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    y=3/8x+6 ?

  44. erdog82
    • 3 years ago
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    so its y=3/8 x +6

  45. erdog82
    • 3 years ago
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    yes!

  46. erdog82
    • 3 years ago
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    wasn't that easier than you thought?

  47. MaeganR
    • 3 years ago
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    A lil bit

  48. erdog82
    • 3 years ago
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    Well, it seemed like the other people were kinda confusing..

  49. MaeganR
    • 3 years ago
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    just a little

  50. erdog82
    • 3 years ago
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    well.. your done!

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