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anonymous

  • one year ago

A line through which two points would be perpendicular to the line y = 2/3x - 5/2? A. (–4, 3) and (–2, –6) B. (–4, –3) and (2, 6) C. (–4, 3) and (2, –6) D. (4, –3) and (2, 6)

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  1. anonymous
    • one year ago
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    \[y = \frac{ 2 }{ 3 }x - \frac{ 5 }{ 2 }\]

  2. texaschic101
    • one year ago
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    can you tell me the slope of y = 2/3x - 5/2 ?

  3. texaschic101
    • one year ago
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    In y = mx + b form, the slope will be the number in the m position. Can you tell me the slope now ?

  4. anonymous
    • one year ago
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    |dw:1433342536124:dw| My drawing sucks but 3/1 I think

  5. texaschic101
    • one year ago
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    watch this.... y = mx + b y = (2/3)x - 5/2 the number in the m position is the slope...so the slope is 2/3 are you still following how I got that ?

  6. anonymous
    • one year ago
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    Yes

  7. texaschic101
    • one year ago
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    but we are looking for a perpendicular line...so we need the negative reciprocal slope. All that means is " flip " the slope and change the sign. So our perpendicular slope has to be -3/2......see how I flipped the slope and changed the sign ? Understand so far ?

  8. anonymous
    • one year ago
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    Yup, reciprocals were always the easiest thing for me XD

  9. texaschic101
    • one year ago
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    don't forget about changing the sign.... so our answer has to have a slope of -3/2 do you know how to find the slopes of your answer choices ?

  10. anonymous
    • one year ago
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    Do the same thing as you did with the question ?? Or do I do it normally

  11. texaschic101
    • one year ago
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    There is a formula...yes, like there wasn't enough already...probably a zillion formulas...anyways, the formula is : slope = (y2 - y1) / (x2 - x1) do you want me to show you how to label your points and find the slope ?

  12. anonymous
    • one year ago
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    I think I got it So like for answer A. It'd be m = (y2-y1) / (x2 - x1) m = (-6 - 3) / (-2 - 2) ??

  13. texaschic101
    • one year ago
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    almost...pay close attention to your numbers and signs (-4,3) and (-2, -6) slope = (-6 - 3) / (-2 -(-4)

  14. texaschic101
    • one year ago
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    so for A.. slope = (-6 - 3) / (-2 - (-4) slope = -9/ (-2 + 4) slope = -9/2........we need a slope of -3/2,,,so this is not correct

  15. anonymous
    • one year ago
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    so -6 - 3 = -9 -2 - -4 = 2 m = -9/2

  16. texaschic101
    • one year ago
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    that is the slope of those points...but we need a slope of -3/2...so thats not it

  17. anonymous
    • one year ago
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    We were thinking the same thing lol. Anyway so for Answer B. (6 - (-3) / (2 - (-4) 6 - -3 = 9 2 - -4 = 6 9/6 so that one is incorrect too

  18. texaschic101
    • one year ago
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    (-4,-3) / (2,6) slope is 9/6...but that reduces...what does that reduce to ?

  19. anonymous
    • one year ago
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    3/2 or 1 1/2

  20. texaschic101
    • one year ago
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    it reduces to 3/2...but we need -3/2....so this is not correct

  21. texaschic101
    • one year ago
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    gotta watch for those stupid signs...they will mess with your head...lol

  22. anonymous
    • one year ago
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    C. (-6 - 3) / (2 - (-4) -6 - 3 = -9 2 - -4 = 6 -9/6 reduce -3/2

  23. anonymous
    • one year ago
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    So C is correct ?

  24. texaschic101
    • one year ago
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    (-4,3) / (2,-6) ... (-6 - 3) / (2 - (-4) -9/6 reduces to -3/2......yep...you got it...WAY TO GO giving you a medal..you deserve it :)

  25. anonymous
    • one year ago
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    Thanks for the help ^^

  26. texaschic101
    • one year ago
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    anytime...as long as its not geometry...not so good at that :)

  27. anonymous
    • one year ago
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    I'm pretty good in geometry XD It's algebra I suck at

  28. texaschic101
    • one year ago
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    I am kinda the opposite....can handle algebra pretty well...just know about the basics in geometry

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