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AriannaA

Find the values of x in the following equation: |9x + 9| = 18

  • one year ago
  • one year ago

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  1. skullpatrol
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    Do you want learn how to work with absolute values?

    • one year ago
  2. AriannaA
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    I just don't get it. >.<

    • one year ago
  3. skullpatrol
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    Let me start with the definition: absolute value: The positive number of any pair of opposite nonzero real numbers is the absolute value of each number in the pair.

    • one year ago
  4. skullpatrol
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    This definition is stating that the absolute value is a POSITIVE number.

    • one year ago
  5. skullpatrol
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    Let me show you with your question how to apply this definition.

    • one year ago
  6. AriannaA
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    Ah. I see. Thank you very much for helping me. I appreciate it. Continue, please. :3

    • one year ago
  7. skullpatrol
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    |dw:1361364277172:dw|

    • one year ago
  8. viniterranova
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    See here http://www.wolframalpha.com/input/?i=abs%28x%29

    • one year ago
  9. skullpatrol
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    Can you solve the equation $$9x +9 =18$$

    • one year ago
  10. skullpatrol
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    Similarly we use the same argument for the opposite of 18 or -18....

    • one year ago
  11. AriannaA
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    With 9x + 9 = 18, the "x" stands for 3, right? :o

    • one year ago
  12. skullpatrol
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    does 9(3) + 9 =?= 18

    • one year ago
  13. skullpatrol
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    27 + 9 =36 =/=18

    • one year ago
  14. ParthKohli
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    Think of it this way:|dw:1361365016230:dw|

    • one year ago
  15. AriannaA
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    So... The answer is 18x?

    • one year ago
  16. skullpatrol
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    No, try and solve for x in $$9x + 9 = 18$$

    • one year ago
  17. skullpatrol
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    |dw:1361365237300:dw|

    • one year ago
  18. skullpatrol
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    @AriannaA Do you follow what I just did?

    • one year ago
  19. AriannaA
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    I'm really confused now.

    • one year ago
  20. skullpatrol
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    Concentrate on ONLY solving the equation. Subtract 9 from both sides, then divide both sides by 9

    • one year ago
  21. skullpatrol
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    |dw:1361365682344:dw|

    • one year ago
  22. viniterranova
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    |dw:1361365739823:dw|

    • one year ago
  23. coreymacg
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    What you have to do Arianna is get X by itself 9x + 9=18 To get this by itself you have to remove things from around the x. 9x + 9 = 18 What ever you do to the left side of the = sign you have to do to the right let em show you 9x + 9 = 18 - 9 - 9 --------------- 9x + 0= 9 /9 /9 /=divide 1x + 0 = 1 ------------- We read this as x = 1 so the answer is x = 1 now plug 1 into x 9(1) + 9 = 19 9 + 9 = 18 18=18 this is true

    • one year ago
  24. viniterranova
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    9x+9=18 and 9x+9=-18 this is taken from definition of the absolute value.

    • one year ago
  25. AriannaA
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    So 18=18 is the answer? I'm sorry if I'm being difficult.

    • one year ago
  26. coreymacg
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    x = 1 is the answer

    • one year ago
  27. coreymacg
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    you have to solve for x because x is the only thing we do not know here.

    • one year ago
  28. AriannaA
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    Oh. I see. :o

    • one year ago
  29. coreymacg
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    Do you understand how I got this answer?

    • one year ago
  30. skullpatrol
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    Do you want me to continue?

    • one year ago
  31. skullpatrol
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    @AriannaA Are you still there?

    • one year ago
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