Question

Which equation shows the substitution method being used to solve the system of linear equations?


x – y = 7

x = y + 3



x = (7 – x) + 3

x – y = y + 3

x – (y + 3) = 7

(y + 3) – y = 7

Answer 1

My answer is A

Answer 2

I'am I right

Answer 3

No

Answer 4

why?

Answer 5

Idk how to answer that, other than, you didn't do it right.

Show your work.

Answer 6

notice the red x's

\[\Large \color{red}{x} – y = 7 \]
\[\Large \color{red}{x} =y+3\]

Answer 7

substitution is another term for replacement

example: a substitute teacher is a temporary replacement teacher.

In mathematics if we had something like x+3 = 5 and we solved for x to get x = 2, then we can replace x with 2 to get 2+3 = 5. This is substitution in action

Answer 8

y+3 x-y=7

Answer 9

D

Answer 10

Yes.

Answer 11

Thank you

Answer 12

yep you replace the first x with (y+3) since they are identical

Answer 13

Thank you