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 The diagram below represents a photograph in a frame. The photo has a perimeter of 23 inches, and the area of the whole figure is 58.5 square inches. If the frame is 1 inch thick, what is the area of the photo in square inches?

 

 May 27, 2021
 #1
avatar+515 
+3

ok, lets say the length and width of the photo is l and w.

then, 2(l+w)=23

and if the frame is 1 inch, (l+1+1)(w+1+1)=58.5

 

then we just solve the system of equations and get l = 7 and w = 4.5 so the area is 31.5

 May 27, 2021
edited by mworkhard222  May 27, 2021
 #2
avatar
+1

Thanks for your help but how did you solve the equations? I can't seem to get a whole number?

Guest May 27, 2021
 #3
avatar+118723 
+1

Do you understand what mworkhard has presented so far?  I will assume so ....

 

2(L+W) = 23 (1)

 

(L+2)(W+2)=58.5  (2)

LW+2(W+L)+4=58.5

sub in (1)

LW+23+4=58.5

LW+27=58.5

LW=31.5

L=31.5/W

 

sub into (1) to find W

2(L+W) = 23 (1)

2(31.5W+W)=23mult both sides by W2W(31.5W+W)=23W63+2W2=23W2w223w+63=0w=23±5295044w=23±254w=23±54w=4.5or7

 

Length = 7  width =4.5 inches

 May 28, 2021
 #4
avatar+515 
+1

omg how did i not see this! Here is how u can solve the system:

  1. Isolate l in 2(l+w)=23 and get l=232w
  2. Plug the solutions l=232w into (l+1+1)(w+1+1)=58.5
  3. For (l+1+1)(w+1+1)=58.5 subsitute l with 232w:w=92,l=7

 

Where I got my steps: https://www.symbolab.com/solver/step-bystep/2%5Cleft(l%2Bw%5Cright)%3D23%2C%20%5Cleft(l%2B1%2B1%5Cright)%5Cleft(w%2B1%2B1%5Cright)%3D58.5

 Jun 1, 2021

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