Question

How do you find the substitution for these?

2x + y = 7

y - x = 1

Answer 1

solve the second equation for y and then plug into the first one

Answer 2

do yo know how to add equations yet?

Answer 3

Solve The Second Equation For Y And Then Plug Into The First One

Answer 4

I kind of know how to add them, but the set up of it being in two is confusing.

Answer 5

y-x=1 find y in that equation. Then plug y into the top equation and then find x.

Answer 6

basically when doing substitution you want to solve one equation for one variable (either x or y in this case) and then plug it into the equation you did not use

Answer 7

Y-x=1 Find Y In That Equation. Then Plug Y Into The Top Equation And Then Find X

Answer 8

Why is damn just restated things people have already said?
lol

Answer 9

well before I continue on, the question given is : Which of the following would not be the result of a substitution in the following system?

these are the options:

7 - 2x - x = 1
2x + x + 1 = 7
2(y + 1) + y = 7

Answer 10

restating*

Answer 11

try doing the suggested manipulation stated above and then see what you get..

Answer 12

What do you mean?

Answer 13

Ill work it out for you...

(1) 2x+y=7
(2) y-x=1

Solving (2) for y yields:
y=x+1--- we can call this (3)

now plugging (3) into (1) :

2x+(x+1)=7

Answer 14

2x+4=7?? and you didn't have to work it out, but thank you for doing so.

Answer 15

Ooops, I misread, that was the answer at the bottom. Thank you for the help, I now know how to set it.