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1 March, 01:39

Which of the following would NOT be the result of a substitution in the following system?

2x + y = 7

y - x = 1

Answers

A. 2 (y + 1) + y = 7

B. 2x + x + 1 = 7

C. 7 - 2x - x = 1

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Answers (1)
  1. 1 March, 03:38
    0
    A

    Step-by-step explanation:

    y-x=1 so to solve for x

    -x = - y + 1

    x = (y - 1) so A is incorrect because it substitutes (y + 1) for x
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