Which of the following would not be the result of a substitution in the following system? 2x + y = 7 y - x = 1
a) 7 - 2x - x = 1
b) 2x + x + 1 = 7
c) 2(y + 1) + y = 7

Option C.

Step-by-step explanation:

A) The result of the substitution shown in Option A is obtained by solving for y from the first equation and substituting into the second equation:

Therefore, this is a result of a substitution in the given system.

B) The result of the substitution shown in Option B is obtained by solving for y from the second equation and substituting into the first equation:

Therefore, this is a result of a substitution in the given system.

C) The result of the substitution shown in Option C is not  a result of a substitution in the given system, because if you solve for x from the second equation and substitute into the first one, you get:

we can't see all full 4 options, but if this is the full option, than the very left one is correct:

-2/5 * -3 3/4

remake the question, adding a picture of all the question, or write down the full left and right answers.