Quantcast

A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

Mttblink

  • 2 years ago

Help with these:/ I don't understand

  • This Question is Closed
  1. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    1 Attachment
  2. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    can you find slope of any given line ?

  3. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    like say , x-5y = -10 is a line. can you find slope of this line first ?

  4. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Uh no not really... with a quick review I probably can

  5. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    good, so i have x-5y =-10 i will try to isolate y and bring it in the form y=mx+c where m=slope so, x=5y-10 5y = x+10 y= (1/5)x +2 got this ?

  6. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Yeah I got it

  7. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    cool, so can you find the slope of x -3y=9 line ? in same way

  8. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    oh and i forgot to mention, y= (1/5)x +2 comparing with y=mx+c gives, m=slope = 1/5

  9. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    x-37=9 -3y=x+9 Y=(1/3)x+3

  10. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    So slope would be 1/3 I assume?

  11. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    correct! :) now try to find slopes of other 3 lines also! and tell me, so that i will verify :)

  12. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    4x+2y=5 2y=-4x+5 Y-(-1/2)x+2.5 ?

  13. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    2y=-4x+5 is correct, but then divide both sides by 2 what u get ?

  14. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    10x-5y=8 -5y=10x+8 Y=-2x+1.6?

  15. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    10x-5y=8 -5y=10x+8 <<<<<<NO! -5y = -10x +8

  16. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    and you would get y=-2+2.5

  17. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Ahh okay -10 so the problem would come out with a positive 2x

  18. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yes, so the slope will be m= 2 , right ?

  19. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Yes

  20. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    4x+2y=5 slope = -2 make a note of all slopes, we'll need them

  21. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    and what about last line ?

  22. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    4x+y=-1 Y=-4x-1

  23. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    so, slope =?

  24. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    -4

  25. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Good! now here's the rule : slope of parallel lines are equal! so, for the last one, slope of line parallel to 4x+y=-1 will also be m=-4 :) so, for last, the correct option will be `C) m=-4` got this ? in same way, can you match the 2nd last and 3rd last ?

  26. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Yeah I got it, Thanks a ton man. You need to be my teacher xD

  27. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    haha, :) but we still require to do the 1st 2 !

  28. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    another rule, `product of slopes of perpendicular lines = -1 ` so, for 1st one we had slope = 1/5 let slope of perpendicular line be m. so, \(\Large m\times (1/5)=-1\) find m from here :)

  29. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    1st one is m=1/5? 2cnd one is m=1/3? It seems like these would be the answers but they are not possible to be selected.

  30. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Ahhhh okay

  31. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    because perpendicular lines follow different rule :)

  32. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Well I still don't exactly get how it goes from (1/5) to -1...

  33. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    product of slopes = -1 is the rule so, m (1/5) =-1 multiplying by 5, m = -5 got this ?

  34. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    multiplying by 5 on both sides.

  35. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    I'm confused on the product of slopes part, I get the multiplying on both sides. So like can you explain the product of slopes rule.. I tried looking it up on google but nothing I can comprehend really comes up.

  36. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    if say line 1 has slope M1 and line 2 has slope M2 now if these 2 lines are perpendicular to each other, then M1*M2 =-1

  37. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    another way to remember the same thing is, the slope of line is negative reciprocal of the perpendicular line, so, slope of line perpendicular to line with slope 1/5 will be - (1/(1/5)) = -5

  38. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    so, thats your 1st one, m =-5 for 2nd one, we had slope = 1/3, so m *(1/3) = -1 so, m=-3 is the answer to 2nd one :)

  39. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Okay, so basically whenever there is a fraction just take (1/_) blank space number lol

  40. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    you forgot the negative :P -1/ stuff

  41. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    but this only applies to perpendicular lines

  42. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    for parallel lines, slope are equal

  43. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Oh I see says the blind man

  44. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    what who ?

  45. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    lol

  46. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    i hope you got the entire problem clearly ?

  47. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    ask if any doubts anywhere

  48. Mttblink
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Yeah I get it now man thanks a ton

  49. hartnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    welcome ^_^

  50. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.