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BioHazard9064

  • one year ago

Help Me Please

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  1. BioHazard9064
    • one year ago
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    I need help with 2 and 3 2.The inequalities: Show the work for finding the inequality that defines each segment. 3.A point: Choose a point within the boundaries of the shape, and show algebraically that the point satisfies all of the inequalities

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  2. BioHazard9064
    • one year ago
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    Idk for sure

  3. BioHazard9064
    • one year ago
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    @mathstudent55 @welshfella can you help me?

  4. BioHazard9064
    • one year ago
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    this sucks xD none can help me

  5. BioHazard9064
    • one year ago
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    ok @Keigh2015 can you help at all?

  6. Keigh2015
    • one year ago
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    Sorry man I can't help

  7. BioHazard9064
    • one year ago
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    ok

  8. welshfella
    • one year ago
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    First find the equations for each of the lines

  9. welshfella
    • one year ago
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    eg The line joining (4,8) and (9,13) is y = x + 4

  10. BioHazard9064
    • one year ago
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    how did you get that?

  11. welshfella
    • one year ago
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    and area under that is y > x + 4

  12. BioHazard9064
    • one year ago
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    y > x + 4 is 4,8 to 9,3?

  13. welshfella
    • one year ago
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    first find the slope y2 - y1 ------ = (13 - 8) / (9-4) = 1 x2 - x1 Then plug this and one of the points into the general equation y - y1 = m(x - x1) y - 13 = 1(x - 9) which simplifies to y = x + 4

  14. welshfella
    • one year ago
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    now you need to do that for the other 3 lines

  15. welshfella
    • one year ago
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    no (4,8) to (9,13)

  16. BioHazard9064
    • one year ago
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    ok so

  17. BioHazard9064
    • one year ago
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    So if (4,8) to (9,13) is y = x + 4

  18. BioHazard9064
    • one year ago
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    Then y2 - y1 ------ = (4 - 8) / (9 - 3) = ? x2 - x1

  19. BioHazard9064
    • one year ago
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    How would I solve that @welshfella

  20. anonymous
    • one year ago
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    4-9 and -8+3

  21. BioHazard9064
    • one year ago
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    ok 4-9 is 5 and -8+3 is -5

  22. anonymous
    • one year ago
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    no 9-4 and -3+ 8 I believe I mixed them up

  23. BioHazard9064
    • one year ago
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    thats 5 and 5

  24. BioHazard9064
    • one year ago
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    so 10?

  25. anonymous
    • one year ago
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    I swear I'm wrong just ask welsh..xD

  26. welshfella
    • one year ago
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    no this line has negative slope and is at right angles to the one joining (4,8) and (9,13) so its slope is -1 y-y1 = m(x - x1) y - 8 = -1(x - 4) y = -x + 4 + 8 y = -x + 12

  27. BioHazard9064
    • one year ago
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    wow i cant believe it im so lost rn

  28. BioHazard9064
    • one year ago
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    is that for 9,3 or 9,13?

  29. welshfella
    • one year ago
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    that is the equation for the line joining (4,8) and )9,3)

  30. welshfella
    • one year ago
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    |dw:1440009717505:dw|

  31. welshfella
    • one year ago
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    there are the slopes of the four lines

  32. anonymous
    • one year ago
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    wow I just got ignored..:O..well then..bye

  33. welshfella
    • one year ago
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    |dw:1440009783646:dw|

  34. BioHazard9064
    • one year ago
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    so for 9,13 to 14,8 is the same then?

  35. welshfella
    • one year ago
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    sorry - i'm ok in English - not brilliant

  36. BioHazard9064
    • one year ago
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    so from 9,13 to 14,8 it would be y = -x + ?

  37. welshfella
    • one year ago
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    yes but you'll need to plug in one of the points - use (9,13)

  38. BioHazard9064
    • one year ago
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    ok so it would look like

  39. welshfella
    • one year ago
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    y - y1 = -1(x - x1) y1 = 13 x1 = 9

  40. welshfella
    • one year ago
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    you have to always that general form y-y1 = m(x - x1)

  41. BioHazard9064
    • one year ago
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    ok so then it would look like this? y = -x + 9

  42. welshfella
    • one year ago
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    no

  43. welshfella
    • one year ago
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    y - 13 = -1(x - 9) now isolate y and simplify the RHS

  44. welshfella
    • one year ago
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    y - 13 = -x + 9 now add 13 to both sides

  45. BioHazard9064
    • one year ago
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    13 and 13 so that would be y= - x + 22?

  46. welshfella
    • one year ago
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    yes

  47. BioHazard9064
    • one year ago
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    ok so that would be 9,13 to 14,8

  48. welshfella
    • one year ago
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    we've just done that one

  49. BioHazard9064
    • one year ago
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    I know

  50. welshfella
    • one year ago
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    lets see what we've got so far y = x+ 4 y = -x _ 12 y = -x + 22 oh we haven't done (9,30 to (14,8)

  51. BioHazard9064
    • one year ago
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    yep

  52. BioHazard9064
    • one year ago
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    I dont know how to start it

  53. welshfella
    • one year ago
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    I 'll have to look the stuff over again I'm not sure if i'm right. Give me a minute

  54. BioHazard9064
    • one year ago
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    ok

  55. welshfella
    • one year ago
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    yea the 3 we've done are ok thats y = -x + 12 though for the line from (9,3) to (14,8) slope = 1 take the point (9 ,3) y - 3 = x - 9 y = x - 6

  56. BioHazard9064
    • one year ago
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    ok

  57. welshfella
    • one year ago
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    so theres the equation for 4 lines y = x+ 4 y = -x + 12 y = x - 6 y = -x + 22

  58. BioHazard9064
    • one year ago
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    thanks so much

  59. welshfella
    • one year ago
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    yw so the inequalities are y <= x + 4 y >= -x + 12 y >= x - 6 y <= -x + 22 that defines the shaded diamond

  60. welshfella
    • one year ago
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    gotta go

  61. BioHazard9064
    • one year ago
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    ok thanks so much

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