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LifeIsADangerousGame

  • 4 years ago

I made a mistake...I have 3 questions left :/

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  1. LifeIsADangerousGame
    • 4 years ago
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    This is the first question:

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  2. LifeIsADangerousGame
    • 4 years ago
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    I need to know how to graph it

  3. myininaya
    • 4 years ago
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    don't forget your little x guy after the 3/2

  4. myininaya
    • 4 years ago
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    you can do that if you want

  5. LifeIsADangerousGame
    • 4 years ago
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    Oh yea, sorry, forgot about that

  6. myininaya
    • 4 years ago
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    |dw:1328068801726:dw|

  7. myininaya
    • 4 years ago
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    |dw:1328068824020:dw|

  8. myininaya
    • 4 years ago
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    |dw:1328068854662:dw|

  9. myininaya
    • 4 years ago
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    |dw:1328068878164:dw|

  10. LifeIsADangerousGame
    • 4 years ago
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    Ohh, ok! Thank you :)

  11. LifeIsADangerousGame
    • 4 years ago
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    Here's the second one:

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  12. LifeIsADangerousGame
    • 4 years ago
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    I know the slope-intercept form (y = 4/8x right?), I need help with the last two

  13. myininaya
    • 4 years ago
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    i'm not getting that

  14. myininaya
    • 4 years ago
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    so we have 4x-8y=8 right?

  15. LifeIsADangerousGame
    • 4 years ago
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    Right

  16. myininaya
    • 4 years ago
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    we want to write in this form y=mx+b so we need to solve for y

  17. LifeIsADangerousGame
    • 4 years ago
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    right

  18. myininaya
    • 4 years ago
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    \[4x=8y+8\]here i added 8y on both sides

  19. myininaya
    • 4 years ago
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    \[4x-8=8y\] here i subtracted 8 on both sides

  20. myininaya
    • 4 years ago
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    \[\frac{4x-8}{8}=\frac{8y}{8}\] here we divided 8 on both sides

  21. LifeIsADangerousGame
    • 4 years ago
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    You mean 4x right?

  22. myininaya
    • 4 years ago
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    \[\frac{4x}{8}-\frac{8}{8}=y\] \[\frac{1}{2}x-1=y\] now we are done! :)

  23. myininaya
    • 4 years ago
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    whats the question?

  24. myininaya
    • 4 years ago
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    \[\text{ we have } y=\frac{1}{2}x-1\]

  25. LifeIsADangerousGame
    • 4 years ago
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    Oohh, ok, so how do I get a perpendicular line to that?

  26. myininaya
    • 4 years ago
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    slope of a perpendicular line is going to have negative reciprocal slope of 1/2

  27. myininaya
    • 4 years ago
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    \[y=\frac{-2}{1}x+b\] see i just flipped the 1/2 and put a negative in front of it

  28. myininaya
    • 4 years ago
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    \[y=-2x+b\]

  29. myininaya
    • 4 years ago
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    so this is the form for any perpendicular line of y=x/2-1

  30. myininaya
    • 4 years ago
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    to*

  31. LifeIsADangerousGame
    • 4 years ago
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    Hmm

  32. myininaya
    • 4 years ago
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    now we are given a point on this line (1,2)

  33. myininaya
    • 4 years ago
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    so instead of using y=-2x+b we could use y-y_1=-2(x-x_1) since it ask for point slope form

  34. LifeIsADangerousGame
    • 4 years ago
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    y - y1 = -2(x - x1) and that's y - 2 = -2(x - 1)?

  35. myininaya
    • 4 years ago
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    yep! :)

  36. LifeIsADangerousGame
    • 4 years ago
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    Thanks! Is it alright if we do the last one?

  37. myininaya
    • 4 years ago
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    ok shoot

  38. LifeIsADangerousGame
    • 4 years ago
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    It's graphing again

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  39. myininaya
    • 4 years ago
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    solve that inequality for y first

  40. LifeIsADangerousGame
    • 4 years ago
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    s\[x + 3y \le 6 = x + 3y -x \le -x \] is that right so far?

  41. LifeIsADangerousGame
    • 4 years ago
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    it cut it off, the end should be -x + 6

  42. myininaya
    • 4 years ago
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    \[3y \le -x+6?\]

  43. LifeIsADangerousGame
    • 4 years ago
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    yea

  44. LifeIsADangerousGame
    • 4 years ago
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    It keeps adding and taking away stuff

  45. LifeIsADangerousGame
    • 4 years ago
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    so would it be \[y \le -x/3 \]\[+ 2?\]

  46. myininaya
    • 4 years ago
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    \[y \le \frac{-1}{3}x+2\]

  47. myininaya
    • 4 years ago
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    on that is what you mean

  48. myininaya
    • 4 years ago
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    yes! :)

  49. LifeIsADangerousGame
    • 4 years ago
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    so that means that I go to the left once, and up three times?

  50. myininaya
    • 4 years ago
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    no top is rise and bottom is run

  51. LifeIsADangerousGame
    • 4 years ago
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    Wait, I go to the 2 for y intercept actually

  52. myininaya
    • 4 years ago
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    yep and then use the slope to find the next point

  53. myininaya
    • 4 years ago
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    |dw:1328070755018:dw|

  54. myininaya
    • 4 years ago
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    but we have y<-x/3+2

  55. myininaya
    • 4 years ago
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    |dw:1328070825319:dw|

  56. myininaya
    • 4 years ago
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    y< means we shade everything below the graph

  57. LifeIsADangerousGame
    • 4 years ago
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    Ok! Thank you! I think I finally got it :P

  58. LifeIsADangerousGame
    • 4 years ago
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    YAY! !oo% Thank you Myininaya!

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