1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Ok easy algebra kicking my kids butt and im new to this again!

  1. Apr 11, 2005 #1
    ok this is problem i will try solve can you verify cuz i don't think 3y is an answer! please help me

    3y ???

    hows this work????

    edited cuz the 1st responder pointed out a sign error i made thanks!
    Last edited: Apr 11, 2005
  2. jcsd
  3. Apr 11, 2005 #2
    You made a mistake in you calculation, 15-21y is not equal to 15+21y.
  4. Apr 11, 2005 #3
    your calculation is wrong. But, what are the instructions? i mean, are u trying to solve for y? And if ur solving for why, u need to clear it, leave y alone
    Last edited: Apr 11, 2005
  5. Apr 11, 2005 #4


    User Avatar

    Staff: Mentor

    Oops, you switched a sign on the right side...

    15 - 24y = 15 - 21y

    That line isn't complete: (also fixing the sign mistake above)

    0 = 24y - 21y
    0 = 3y

    Now, what's the only value of y that can make that true? :smile:
  6. Apr 11, 2005 #5
    directions say

    soulve the equation so i assume solve for y, most other of his problems are solving for some x or y value i.e. x=this or that
  7. Apr 11, 2005 #6
    Edit: This information has already been posted.

    He is probably trying to solve for the variable y. In his calculations above, he also forgot to complete the line "24y+21y" (which is incorrect) and show that it equals zero.
  8. Apr 11, 2005 #7


    User Avatar
    Science Advisor
    Homework Helper

    Your algebra is fine and the only solution is y=0.Can u see why?

  9. Apr 11, 2005 #8
    it would have to be 0

    i am going to say 0 and thanks for helping on old guy with kids homework, helps keep the brain on all cylinders :)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook