Which of the following represents a valid first step to solving this system of equations using the substitution method? 2x - y = 7 x = 2y - 1 x = 2(2x - y) - 1 2x - (2y - 1) = 7 2x - y = 2y - 1 2(2y - 1)- y = 7

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter6: Systems Of Linear Equations And Inequalities
Section: Chapter Questions
Problem 18PT
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Which of the following represents a valid first step to solving this system of equations using the substitution method?

2x - y = 7

x = 2y - 1

  1. x = 2(2x - y) - 1

  2. 2x - (2y - 1) = 7

  3. 2x - y = 2y - 1

  4. 2(2y - 1)- y = 7

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