atropf48494 atropf48494

26-05-2020
Mathematics

contestada

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

Respuesta :

26-05-2020

Answer:

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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