bammbamm538
22.06.2019 •
Mathematics
Which of the following would not be the result of a substitution in the following system? 2x + y = 7y - x= 1a. 7 - 2x- x = 1b. 2x + x + 1 = 7c. 2(y + 1) + y = 7
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Ответ:
The correct option is:
C.
Why?To find which of the given options are not the result of a substitution in the given system, we need to isolate the variable in function of the other variable, and then substitute it.
So, substituting and discarding, we have:
- First equation:
Isolating "y", we have:
Then, substituting it into the second equation, we have:
We have that it's a result of a substitutiong in the following system (option A)
- Second equation:
Isolating "y", we have:
Then, substituting it into the first equation, we have:
Have a nice day!
Ответ: