Need algebra help with: what are dimensions of this rectangle in centimeters?

label Algebra
account_circle Unassigned
schedule 1 Day
account_balance_wallet $5

Jan 6th, 2016

hello

perimeter = 2( length + width)

     42      = 2 (x+4 +2x-7)

      42     = 2( 3x -3 )

     42/2  =  3x-3

      21   = 3x-3

      21+3= 3x

        24 = 3x

         x = 24/3

         x= 8..


length = x+4 = 8+4 = 12................................answer

width = 2x-7 = 2*8 - 7 =9..............................answer



answer is

J.length= 12  and width = 9




hope you understood..please message if you have any doubts...thank you
Jan 6th, 2016

why did you divide by 2 instead of distributing the 2 to the 3x-3

Jan 6th, 2016

you can do that also ,

answer will be same

i will show you

 42     = 2( 3x -3 )

42 = 2*3x - 2*3

 42 = 6x - 6

42+6 =6x

  48 = 6x

   x = 48/6

   x = 8


this is the same answer i got before , x=8




Jan 6th, 2016

Ohhh thank you 

Jan 6th, 2016

Studypool's Notebank makes it easy to buy and sell old notes, study guides, reviews, etc.
Click to visit
The Notebank
...
Jan 6th, 2016
...
Jan 6th, 2016
Jun 29th, 2017
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer