Simultaneous equations using elimination

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0:00 Preface
1:16 Introduction - Demonstrating the algebra of simultaneous equations
7:21 EXAMPLE 29 - Using the elimination method with matching pairs of terms
12:02 EXAMPLE 30 - Using the elimination method to solve simultaneous equations
18:19 Summary

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In this subject we use the following books:
Cambridge Essential Mathematics: For the Victorian Curriculum Level 10 and 10a
David Greenwood, Sara Woolley, Jenny Goodman, Jennifer Vaughn, Stuart Palmer
CAMBRIDGE UNIVERSITY PRESS
Cambridge, United Kingdom
PUBLISHED: 2019 – 2nd edition
ISBN: 978110877290
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Hi Matthew, sorry but I'm a little confused at 4:09. How does x+y = 5 if x = 3 and y = 5??? x+y should be 8. Am I correct in thinking this or did I totally miss something earlier in the vid?
Cheers

caelanharamis