how to solve step by step using either elimination-addition or substitution: x+y=1000 0.07x+0.09y=82

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter9: Systems Of Linear Equations
Section9.2: The Substitution Method
Problem 25WE
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how to solve step by step using either elimination-addition or substitution:

x+y=1000

0.07x+0.09y=82

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