Math

The sum of three times a number and 2 less than 4 times that same number is 15. Which of the following equations could be used to find the value of the number , n?
1. 3n + 4n-2=15
2. 3n t 4(n-2)=15
3. 4n +3(n-2)=15
4. 3n - 4(n-2) = 15
I pick 3.

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  1. Nope.

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    bobpursley
  2. The sum of three times a number and 2 less than 4 times that same number is 15
    The sum of ... +
    three times a number .... 3x
    2 less than 4 times that same number--- 4x - 2
    is ---- = 15

    so 3x + 4x - 2 = 15

    none of your choices match that

    solving:
    7x = 17
    x = 17/7

    check:
    3 times the number = 51/7
    2 less than 4 times the number = 4(17/7) - 2 = 54/7
    their sum = 51/7 + 54/7 = 98/7 = 15
    as required

    My answer is correct but not obtainable with any of the given choices.

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  3. what is this form called

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