My Math Forum 2 variable equations

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 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 %

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