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

  • Thread starter thomas576
  • Start date
  • #1
20
1
4(2-6y)+7=3(5-7y)
ok this is problem i will try solve can you verify cuz i don't think 3y is an answer! please help me

8-24y+7=15-21y
15-24y=15-21y
24y-21y
3y ???

hows this work????

edited cuz the 1st responder pointed out a sign error i made thanks!
 
Last edited:

Answers and Replies

  • #2
396
2
You made a mistake in you calculation, 15-21y is not equal to 15+21y.
 
  • #3
2
0
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:
  • #4
jtbell
Mentor
15,803
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thomas576 said:
4(2-6y)+7=3(5-7y)
ok this is problem i will try solve can you verify cuz i don't think 43y is an answer! please help me

8-24y+7=15-21y
15-24y=15+21y

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

15 - 24y = 15 - 21y


24y+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:
 
  • #5
20
1
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
 
  • #6
396
2
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.
 
  • #7
dextercioby
Science Advisor
Homework Helper
Insights Author
13,104
652
Your algebra is fine and the only solution is y=0.Can u see why?

Daniel.
 
  • #8
20
1
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 :)
 

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