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 September 20th, 2011, 05:56 AM #1 Newbie   Joined: Sep 2011 Posts: 9 Thanks: 0 Linear equation in three variables What is the value of “y” in the following system of equations? x + y + z = 75 ; -2x + y – z = -15 a. 0 b. 5 c. 15 d. 60 September 20th, 2011, 08:10 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,931 Thanks: 2205 Is something mistyped or omitted? The equations imply that y = 30 + x/2 = 45 - z/3. September 20th, 2011, 12:42 PM   #3
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Re: Linear equation in three variables

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 Originally Posted by Qwertyqwerty What is the value of “y” in the following system of equations? x + y + z = 75 ; -2x + y – z = -15 a. 0 b. 5 c. 15 d. 60
You have 3 unknowns - you need 3 equations. September 20th, 2011, 03:31 PM #4 Global Moderator   Joined: Dec 2006 Posts: 20,931 Thanks: 2205 With only the two equations, y can't be calculated, but you can calculate 3x + 2z. September 20th, 2011, 10:38 PM #5 Newbie   Joined: Sep 2011 Posts: 9 Thanks: 0 Re: Linear equation in three variables This is it, word for word. Thanks anyway. Tags equation, linear, variables Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post Dreamyvarela Applied Math 1 January 8th, 2014 02:15 PM under72 Linear Algebra 0 November 11th, 2011 05:51 AM under72 Advanced Statistics 0 November 10th, 2011 05:26 PM maxpalme Algebra 1 April 2nd, 2009 10:33 AM maxpalme Abstract Algebra 1 December 31st, 1969 04:00 PM

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