If 4 times a number is added to 9, the result is 49

Discussion in 'Calculator Requests' started by math_celebrity, Nov 23, 2018.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    If 4 times a number is added to 9, the result is 49.

    A number means an arbitrary variable, let's call it x.

    4 times a number means we multiply x by 4
    4x

    Added to 9 means we add 9 to 4x
    4x + 9

    The result is means we have an equation, so we set 4x + 9 equal to 49
    4x + 9 = 49 <-- This is our algebraic expression

    To solve this equation, we type it in the search engine and get x = 10
     

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