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BrizyBaby16

  • 3 years ago

What quadrant are the equations in? A. 3x + 2y = -15 x - 4y = -20 B. 10x - y = -30 x - y = -2 C. 2x - 5y = 10 x + 2y = 10 D. 3x + y = 9 -7x - 7y = -14

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  1. aminah.love18
    • 3 years ago
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    go there for some accuarate help

  2. BrizyBaby16
    • 3 years ago
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    I don't have a library card #. That's not going to help me.

  3. aminah.love18
    • 3 years ago
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    240100447204

  4. aminah.love18
    • 3 years ago
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    try that

  5. aminah.love18
    • 3 years ago
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    lemme know what happens

  6. BrizyBaby16
    • 3 years ago
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    It worked but I don't see it helping me too much.

  7. aminah.love18
    • 3 years ago
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    ok you shouldve pressed the math section

  8. BrizyBaby16
    • 3 years ago
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    I did.

  9. aminah.love18
    • 3 years ago
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    ok then you fill out the information on the bottom it shouldve let you type in your qestion

  10. BrizyBaby16
    • 3 years ago
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    Would this be algebra I or II?

  11. aminah.love18
    • 3 years ago
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    algebra 2

  12. BrizyBaby16
    • 3 years ago
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    What subtopic?

  13. aminah.love18
    • 3 years ago
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    what are your choices

  14. BrizyBaby16
    • 3 years ago
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    would it be graphing functions?

  15. aminah.love18
    • 3 years ago
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    yes

  16. BrizyBaby16
    • 3 years ago
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    I just need to know how to graph them.

  17. aminah.love18
    • 3 years ago
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    girl go the bottom of tha page and get a tutor a live tutor will help you out

  18. BrizyBaby16
    • 3 years ago
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    I don't like that site.

  19. aminah.love18
    • 3 years ago
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    lol ok then well their helpful i jsut uesd them rite now and they gave me the rite answer to everyting

  20. keketsu
    • 3 years ago
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    Brizy, here's something else you can also try. Go to http://fooplot.com. It will graph the equations for you and you can see what quadrants they are in. You do have to solve for y first. So your first equation in A would be: 3x + 2y = -15 2y = -3x - 15 y = (-3/2)x - (15/2) Then you'd enter everything right of the "=" sign on that website. Hope that helps.

  21. aminah.love18
    • 3 years ago
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    now thats coool im gonna try that

  22. BrizyBaby16
    • 3 years ago
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    Yeah that seems complicated :-(

  23. aminah.love18
    • 3 years ago
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    my god girl you are hard to please

  24. BrizyBaby16
    • 3 years ago
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    Lol I've herd that before :-)

  25. keketsu
    • 3 years ago
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    Haha. It does take some work, but that process should at least make it easier.

  26. aminah.love18
    • 3 years ago
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    ya try it

  27. aminah.love18
    • 3 years ago
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    oh shadowfiend was here

  28. shadowfiend
    • 3 years ago
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    Still is.

  29. aminah.love18
    • 3 years ago
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    aaaaahhhhhh

  30. aminah.love18
    • 3 years ago
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    have i metntioned you look wonderful today:)

  31. shadowfiend
    • 3 years ago
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    BrizyBaby—the easiest way to answer these question is usually to graph them, honestly.

  32. BrizyBaby16
    • 3 years ago
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    I don't know how to graph the equations....that's what I need help with.

  33. shadowfiend
    • 3 years ago
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    Got it! Now we're at the heart of the problem :)

  34. shadowfiend
    • 3 years ago
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    Let's start with A then. We have two equations: 3x + 2y = -15 x - 4y = -20

  35. aminah.love18
    • 3 years ago
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    well i give up nice meeting you thoug Brizzy

  36. BrizyBaby16
    • 3 years ago
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    I need a easy way to know how to graph them.

  37. BrizyBaby16
    • 3 years ago
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    You too aminah.love18

  38. shadowfiend
    • 3 years ago
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    I find it easiest to graph equations when they're in y = mx + b (slope-intercept) form. So first things first, we try to solve the equations for y: \[\begin{align} 3x + 2y &= -15\\ 2y &= -3x - 15\\ y &= \frac{-3x - 15}{2} = -\frac{3}{2}x - \frac{15}{2} \end{align}\] And the other one: \[\begin{align} x - 4y &= -20\\ -4y &= -20 - x\\ y &= \frac{-20 - x}{4} = \frac{-20}{4} - \frac{1}{4}x\\ y &= -5 - \frac{1}{4}x = -\frac{1}{4}x - 5 \end{align}\]

  39. shadowfiend
    • 3 years ago
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    So, we now have: y = -3/2 x - 15/2 y = -1/4x - 5 The first thing to notice is that both of these have a negative slope. Do you know what a negative slope means on a graph?

  40. BrizyBaby16
    • 3 years ago
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    I don't get how you did the equations but yeah a negative slope goes down left to right.

  41. shadowfiend
    • 3 years ago
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    Whoops. Sorry then, let's go back to that :) Let's start with 3x + 2y = -15. We're trying to solve for y. That means we need y alone. Remember that an equation doesn't change if we subtract the same thing from both sides. So first things first, we move the 3x to the right: 3x + 2y = -15 3x - 3x + 2y = -15 - 3x Subtract 3x from both sides, 3x - 3x is 0: 0 + 2y = -15 - 3x 2y = -15 - 3x (We leave off the 0.) Then we need to get rid of the 2. Dividing the same thing from both sides also leaves the equation unchanged, so we'll divide by 2: y = (-15 - 3x) / 2 y = -15/2 - 3/2 x Does that make more sense?

  42. BrizyBaby16
    • 3 years ago
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    yeah. So the points are -7.5 and -1.5?

  43. shadowfiend
    • 3 years ago
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    Close! :) This means that the line is, like we said, going top left to bottom right. It means for every 3 units down that it goes, it goes two units to the right. And it means that it meets the y axis at -7.5. A quick, semi-accurate drawing: |dw:1329863330467:dw|

  44. BrizyBaby16
    • 3 years ago
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    What did I get wrong?

  45. shadowfiend
    • 3 years ago
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    So you can see here that that line is in quadrants II, III, and IV: |dw:1329863470553:dw|

  46. shadowfiend
    • 3 years ago
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    -1.5 isn't a point, it's the slope, that's all.

  47. BrizyBaby16
    • 3 years ago
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    So, it's in the third Quadrant?

  48. shadowfiend
    • 3 years ago
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    Well, that's what I'm not 100% clear on in the question. Obviously this line goes through three quadrants. Is the question asking which quadrant both lines are in or..?

  49. BrizyBaby16
    • 3 years ago
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    Well does it mean what quadrant the slope is in?

  50. shadowfiend
    • 3 years ago
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    Sorry -> slope isn't really in a quadrant. It just tells you how the line moves from one position to another (i.e., what angle it's at).

  51. shadowfiend
    • 3 years ago
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    It probably means what quadrant the two lines meet in, so let's look at the other line.

  52. shadowfiend
    • 3 years ago
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    y = -1/4x - 5 So we have a slope of 1/4, meaning for every one unit we go down, we move to the right 4 units. And -5 is the y-intercept, which means the line meets the y axis at -5. Another rough drawing: |dw:1329864223848:dw|

  53. shadowfiend
    • 3 years ago
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    If we put the two together: |dw:1329864317169:dw|

  54. shadowfiend
    • 3 years ago
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    You can see there that they do in fact intersect in quadrant III.

  55. BrizyBaby16
    • 3 years ago
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    So for A it's Quadrant III?

  56. shadowfiend
    • 3 years ago
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    I would assume so. Again, the question isn't *super* clear, but I think that's what it's asking for.

  57. BrizyBaby16
    • 3 years ago
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    Okay thanks :-)

  58. shadowfiend
    • 3 years ago
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    Glad I could help :)

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