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February 13th, 2016, 09:48 AM  #1 
Newbie Joined: May 2010 Posts: 6 Thanks: 0  length times width and getting a new equation for area?
So here's my problem. l = 52  2w I need to write an equation for area based on width using the above equation. What am I missing here? Whatever the equation is, I have to enter it into my calculator to see the parabola, get the vertex, etc. I just can't figure out what the equation is I'm supposed to enter. Any info would be appreciated. Thanks! 
February 13th, 2016, 09:50 AM  #2 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,636 Thanks: 2621 Math Focus: Mainly analysis and algebra 
$A=lw$, and $l=522w$, so substitute.

February 13th, 2016, 10:01 AM  #3 
Newbie Joined: May 2010 Posts: 6 Thanks: 0 
Thanks. Still confused though! We're using a word problem asking about 52 panels, each 1ft long. The back of a house will close in one side of the patio. The question is: Generalize a model (equation) for calculating the length (l) in terms of the width (w). Hint: work from perimeter: P=2l +2w I'm assuming I'm right with the first part (l = 52  2w). But nothing I graph shows a parabola. 
February 13th, 2016, 11:16 AM  #4 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,932 Thanks: 1127 Math Focus: Elementary mathematics and beyond 
What is the exact problem statement (as worded by your instructor)? Include all given information.


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area, equation, length, times, width 
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