Question

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Answer 1

All you need to do is solve for x in the second equation, and you will get one of the answers.

Answer 2

You should get x=8-y.
First add y to the other side, and then divide through by -1.

Answer 3

you need to substitute tha value of x into first equation....from second equation.. can you tell me what is your second euation?

Answer 4

You are just trying to find what equation you would substitute in.

Answer 5

ok.. here your question says
what expression would you substitute into the first equation?
that means you just need to find the value to substitue so that you can solve later on
BUt you have solved it by following the example in your note

Answer 6

You did that right, but its just wanting you to isolate the second equation for x,i.e. solve for x and that is what your answer should be. The question is not wanting you to work it out. Just find what you are sustituting in.

Answer 7

Yes.

Answer 8

so let us go back to the first step... can you just tell me which is first uqtion and second equation.. (it is obivious fromthe options... but I want you to know what you are doing)

Answer 9

i didnt know 8-y was the answer it was a guess
first 2x + y = 9
second -x - y = -8

Answer 10

yes... now your question says "what expression would you substitute into the first equation?

".... can you tllme what that means?

Answer 11

*tell me

Answer 12

-x - y = -8?

Answer 13

yes.. ok.. let me help you it means.. you need to find a value to substitute in first equation.. and only we have second equation is left... you are correct

Answer 14

now look at the options... which variable is there in options

Answer 15

y

Answer 16

yup... so... you have to substitue a value which contain... y.... and also from second equation... so which variable has to be replaced?

Answer 17

x?

Answer 18

Yes... and reason?

Answer 19

eliminate to find y? idk

Answer 20

yes... exactly right?.... so how you can find that value of x from second equation

Answer 21

**Exactly right

Answer 22

so how do i start doing it?

Answer 23

ok..so we have second equation.. and ar you convinced that w have to eliminate x and we can do that from second equation?

Answer 24

huh?

Answer 25

means we need to find the value of x ( since option is interms of y) to substitute (sorry for my bad english)

Answer 26

thats fine. how do i do that?

Answer 27

what expression would you substitute into the first equation? -- from question
we have second equation and can you tll me onc again what was second equation?

Answer 28

-x-y=-8

Answer 29

welll... what is
-x = ???

Answer 30

-1

Answer 31

not trying to rush you but can you hurry && show me how to do this bc my son needs me right now. please && thank you :)

Answer 32

can you check again... Clue ( the equality will not change when same number is added or subtracted or divided or multiplied)

Answer 33

mmmm...ok... add -y to both sides of equal sign what you get?

Answer 34

y = -8 - x

Answer 35

-y and + y cancels so what is left?

Answer 36

i gotta go sorry. thanks for all of your help.

Answer 37

Ok I will write the steps.. so if you have any doubt can post here

Answer 38

sorry this is corrct -x-y+y =-8+y (not -8-y, i made a mistak there)
now -x = -8+y
multiply both side by - sign we get
x = 8-y
which is th answer
i am so sorry that I had to right the steps directly.. but hope you will commet.. if this dosn't get you..