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anonymous

  • one year ago

I need help

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    I think its c but I'm not sure

  3. anonymous
    • one year ago
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    @abdul_shabeer

  4. iGreen
    • one year ago
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    Plug in x + 3 for 'y' in the first equation

  5. iGreen
    • one year ago
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    \(\sf -x - (x + 3) = 1\) Solve for 'x'..can you do that?

  6. anonymous
    • one year ago
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    -1, 2?

  7. iGreen
    • one year ago
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    No, don't guess.. do you know what -x - x is?

  8. iGreen
    • one year ago
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    It's the same as -1 - 1, but you put an 'x' next to it..so what's -1 - 1?

  9. anonymous
    • one year ago
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    im not sure

  10. iGreen
    • one year ago
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    You don't know what -1 - 1 is?

  11. anonymous
    • one year ago
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    -2

  12. iGreen
    • one year ago
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    Yes..so -x - x = -2x

  13. iGreen
    • one year ago
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    So we have: \(\sf -2x - 3 = 1\) Add 3 to both sides

  14. anonymous
    • one year ago
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    1 - 3 +4 ?

  15. iGreen
    • one year ago
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    ???

  16. anonymous
    • one year ago
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    added 3 to both sides

  17. iGreen
    • one year ago
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    \(\sf -2x - 3 + 3 = 1 + 3\) \(\sf -2x \cancel{- 3 + 3} = 1 + 3\)

  18. iGreen
    • one year ago
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    Which gives us: \(\sf -2x = 1 + 3\)

  19. anonymous
    • one year ago
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    okay

  20. iGreen
    • one year ago
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    1 + 3 = ?

  21. anonymous
    • one year ago
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    4

  22. iGreen
    • one year ago
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    Yes, so we have: \(\sf -2x = 4\) Divide -2 to both sides.

  23. anonymous
    • one year ago
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    -0.5

  24. anonymous
    • one year ago
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    1 = -0.5

  25. iGreen
    • one year ago
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    No.. \(\sf \dfrac{-2x}{-2} = \dfrac{4}{-2}\) \(\sf \dfrac{\cancel{-2}x}{\cancel{-2}} = \dfrac{4}{-2}\) \(\sf x = \dfrac{4}{-2}\) Divide

  26. anonymous
    • one year ago
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    i got -2

  27. anonymous
    • one year ago
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    x = -2

  28. iGreen
    • one year ago
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    Yeah, that's our x-value..now which option has an x-value of -2?

  29. anonymous
    • one year ago
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    B and d

  30. iGreen
    • one year ago
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    No..

  31. iGreen
    • one year ago
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    Only one of them do..

  32. anonymous
    • one year ago
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    oh, my mistake. its b

  33. iGreen
    • one year ago
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    Yep, that's our answer.

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