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lala365

  • 3 years ago

how do you find the length of CD?

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  1. VeritasVosLiberabit
    • 3 years ago
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    use a ruler

  2. VeritasVosLiberabit
    • 3 years ago
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    ;)

  3. lala365
    • 3 years ago
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    |dw:1354672985724:dw|

  4. VeritasVosLiberabit
    • 3 years ago
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    \[1x+4 = 4x\]

  5. VeritasVosLiberabit
    • 3 years ago
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    or is that a 2x

  6. VeritasVosLiberabit
    • 3 years ago
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    \[2x+4 = 4x\]

  7. lala365
    • 3 years ago
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    that is a 2. srry

  8. VeritasVosLiberabit
    • 3 years ago
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    or Im sorry dont multiply by two, just solve for x and plugin the x in the equation for line CD and you have your answer.

  9. lala365
    • 3 years ago
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    but how do i do that?

  10. VeritasVosLiberabit
    • 3 years ago
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    use the equation i gave you above.

  11. VeritasVosLiberabit
    • 3 years ago
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    you see that both line segments CD and AD are congruent, therefore you can set them equal to each other and solve for x.

  12. lala365
    • 3 years ago
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    oh ok.so then i would multiply the 2x and 4x together?

  13. VeritasVosLiberabit
    • 3 years ago
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    no you will need to use the opposite operations in order to isolate x.

  14. lala365
    • 3 years ago
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    so i divide? them

  15. VeritasVosLiberabit
    • 3 years ago
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    no not divide, try again.

  16. VeritasVosLiberabit
    • 3 years ago
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    you can also see it as 4+2x = 4x

  17. lala365
    • 3 years ago
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    add them

  18. lala365
    • 3 years ago
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    but how does that = 4x?

  19. VeritasVosLiberabit
    • 3 years ago
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    no not add look at you signs

  20. VeritasVosLiberabit
    • 3 years ago
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    the line segment CD = AD therefore they are equal.

  21. VeritasVosLiberabit
    • 3 years ago
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    the two lines you drew in the middle of them means they are the same length.

  22. lala365
    • 3 years ago
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    so im not understanding. im so sorry. how do i solve the problem then?

  23. VeritasVosLiberabit
    • 3 years ago
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    How do you think you would attempt it? I've pretty much given you all of the information and even how to setup the problem.

  24. lala365
    • 3 years ago
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    2x+4=4x . i multiply the 2x and 4x to get 8x?

  25. VeritasVosLiberabit
    • 3 years ago
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    no you need to subtract 2x from 4x

  26. VeritasVosLiberabit
    • 3 years ago
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    rearrange your equation to see this better. 4+2x = 4x

  27. lala365
    • 3 years ago
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    so -2x?

  28. VeritasVosLiberabit
    • 3 years ago
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    write your whole equation.

  29. lala365
    • 3 years ago
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    4+2x=4x

  30. VeritasVosLiberabit
    • 3 years ago
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    now subtract 2x from both sides of your equation.

  31. VeritasVosLiberabit
    • 3 years ago
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    and rewrite what you get.

  32. lala365
    • 3 years ago
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    x+4=2x

  33. VeritasVosLiberabit
    • 3 years ago
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    not quite. that extra x on the left should not be there so it should be 4 = 2x

  34. VeritasVosLiberabit
    • 3 years ago
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    now one more step to solve for x

  35. lala365
    • 3 years ago
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    i divide it by 2 right?

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