
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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January 28th, 2017, 11:43 AM  #1 
Newbie Joined: Jan 2017 From: Britain Posts: 18 Thanks: 0  Macro economics equation
Having some basic problems with economic equations: Y =0.5Y + 200 +I becomes: Y = (200+I)/0.5 Can anyone show me the steps to get from the first to the second? many thanks, Simon 
January 28th, 2017, 12:13 PM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,595 Thanks: 1285 
$y = 0.5y + 200 + I$ $y  0.5y = 200 + I$ $y(10.5) = 200+I$ $y(0.5) = 200+I$ $y = \dfrac{200+I}{0.5} = 2(200+I)$ 
January 28th, 2017, 12:50 PM  #3 
Newbie Joined: Jan 2017 From: Britain Posts: 18 Thanks: 0  Thanks!
many thanks for the help I always seem to fall down on the fact that : Y  0.5Y can be factored into y(10.5) . The last equation I posted which you kindly solved for me had the same conceptual step. Maybe it will sink in one day 

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