
Linear Algebra Linear Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
September 13th, 2016, 04:52 PM  #1 
Member Joined: Mar 2016 From: NJ Posts: 48 Thanks: 2  linear equation with a constraint x>=35
Hi, Does anyone have any advice on how to plot x>=35 (or any number) on a ti83 plus? If I'm trying to solve a linear programming problem, such as maximizing 5x+6y with various constraints, I don't know how to ensure I get the correct answer if one of the constraints if x>= anything other than zero. This has happened often now where it will be x>=35 and it intersects at a point where I feel like I have to guess. I'd like to use a graphing calculator to ensure I'm getting the right answer but I don't see how anyone does this if you can't do anything on the xaxis. An example of what I mean is found here where the person graphs the constraints on desmos.com where it accepts x=45. But if I'm taking a test how am I supposed to do this on a graphing calculator? 
September 13th, 2016, 06:22 PM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,921 Thanks: 1518 
1. enter the functions as shown in the first screenshot 2. set a viewable window 3. graph the functions. hit the trace button, then type 45. the point (45,75) will display at the bottom of the screen. 4. hit the down arrow button, type in 45 again ... the point (45,60) will display at the bottom of the screen. 
September 14th, 2016, 07:13 AM  #3 
Member Joined: Mar 2016 From: NJ Posts: 48 Thanks: 2 
Thanks!


Tags 
constraint, equation, linear, x>35, x>35 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Integer linear programming  auxillary binary range constraint variable  Akcope  Applied Math  0  March 19th, 2016 09:58 AM 
linear programming  I have a question for 1 constraint  cirisiamo  New Users  0  May 15th, 2015 04:25 AM 
constraint problem  helloprajna  Economics  0  February 17th, 2013 11:04 PM 
Converting a linear graph to a linear equation?  Regnes  Algebra  3  July 13th, 2011 04:56 PM 
Optimization of a Matrix with one constraint.  shack  Linear Algebra  3  December 17th, 2007 01:11 PM 