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 Linear Algebra Linear Algebra Math Forum

 September 8th, 2011, 04:18 PM #1 Newbie   Joined: Sep 2011 Posts: 1 Thanks: 0 2 variable equations hi to all i am back in college and i have difficulties in math here is my math problem: my portfolio gained 1.1% overal ,my first bond gained 7.7% and my second lost 3.3% what is the the initial % invested in my second bond?here is my reflection x=first bond equation 1 : x+y=100 y=second bond equation 2 : 0.077x-0.033y=1.1 isolate x in equation 2 x=(1.1+0.033y)/0.077 then substitute this value in the equation 1 that give : (1.1+0.033y)/0.077 )+y=100 then i am blocked... i am not able to isolate my y in this equation please help me i am going crazy September 8th, 2011, 04:52 PM #2 Senior Member   Joined: Feb 2009 From: Adelaide, Australia Posts: 1,519 Thanks: 3 Re: 2 variable equations x + y = 100 x (0.077) + y (-0.033) = 100 (0.011) Multiply the first equation by 0.077: 0.077 x + 0.077 y = 7.7 0.077 x - 0.033 y = 1.1 Take the second equation from the first: 0.110 y = 6.6 y = 60 % Tags equations, variable 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 ZeusTheMunja Linear Algebra 20 January 25th, 2013 05:52 AM claudiomalk Algebra 2 November 9th, 2012 08:52 PM daigo Algebra 1 February 21st, 2012 07:13 PM napninja4 Algebra 2 February 15th, 2011 08:21 AM maximade Calculus 4 June 15th, 2010 07:37 PM

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