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pinkmommy

  • 2 years ago

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  1. avery23
    • 2 years ago
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    All you need to do is solve for x in the second equation, and you will get one of the answers.

  2. avery23
    • 2 years ago
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    You should get x=8-y. First add y to the other side, and then divide through by -1.

  3. Rosh007
    • 2 years ago
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    you need to substitute tha value of x into first equation....from second equation.. can you tell me what is your second euation?

  4. avery23
    • 2 years ago
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    You are just trying to find what equation you would substitute in.

  5. Rosh007
    • 2 years ago
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    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

  6. avery23
    • 2 years ago
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    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.

  7. avery23
    • 2 years ago
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    Yes.

  8. Rosh007
    • 2 years ago
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    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)

  9. pinkmommy
    • 2 years ago
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    i didnt know 8-y was the answer it was a guess first 2x + y = 9 second -x - y = -8

  10. Rosh007
    • 2 years ago
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    yes... now your question says "what expression would you substitute into the first equation? ".... can you tllme what that means?

  11. Rosh007
    • 2 years ago
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    *tell me

  12. pinkmommy
    • 2 years ago
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    -x - y = -8?

  13. Rosh007
    • 2 years ago
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    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

  14. Rosh007
    • 2 years ago
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    now look at the options... which variable is there in options

  15. pinkmommy
    • 2 years ago
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    y

  16. Rosh007
    • 2 years ago
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    yup... so... you have to substitue a value which contain... y.... and also from second equation... so which variable has to be replaced?

  17. pinkmommy
    • 2 years ago
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    x?

  18. Rosh007
    • 2 years ago
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    Yes... and reason?

  19. pinkmommy
    • 2 years ago
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    eliminate to find y? idk

  20. Rosh007
    • 2 years ago
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    yes... exactly right?.... so how you can find that value of x from second equation

  21. Rosh007
    • 2 years ago
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    **Exactly right

  22. pinkmommy
    • 2 years ago
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    so how do i start doing it?

  23. Rosh007
    • 2 years ago
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    ok..so we have second equation.. and ar you convinced that w have to eliminate x and we can do that from second equation?

  24. pinkmommy
    • 2 years ago
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    huh?

  25. Rosh007
    • 2 years ago
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    means we need to find the value of x ( since option is interms of y) to substitute (sorry for my bad english)

  26. pinkmommy
    • 2 years ago
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    thats fine. how do i do that?

  27. Rosh007
    • 2 years ago
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    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?

  28. pinkmommy
    • 2 years ago
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    -x-y=-8

  29. Rosh007
    • 2 years ago
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    welll... what is -x = ???

  30. pinkmommy
    • 2 years ago
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    -1

  31. pinkmommy
    • 2 years ago
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    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 :)

  32. Rosh007
    • 2 years ago
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    can you check again... Clue ( the equality will not change when same number is added or subtracted or divided or multiplied)

  33. Rosh007
    • 2 years ago
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    mmmm...ok... add -y to both sides of equal sign what you get?

  34. pinkmommy
    • 2 years ago
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    y = -8 - x

  35. Rosh007
    • 2 years ago
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    -y and + y cancels so what is left?

  36. pinkmommy
    • 2 years ago
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    i gotta go sorry. thanks for all of your help.

  37. Rosh007
    • 2 years ago
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    Ok I will write the steps.. so if you have any doubt can post here

  38. Rosh007
    • 2 years ago
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    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..

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