Bawi solves a problem that has an answer of x = -4. He first added 7 to both sides of the equal sign

Discussion in 'Calculator Requests' started by math_celebrity, Sep 9, 2020.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    Bawi solves a problem that has an answer of x = -4. He first added 7 to both sides of the equal sign, then divided by 3. What was the original equation

    1. If we added 7 to both sides, that means we had a minus 7 (-7) to start with as a constant. Since subtraction undoes addition.
    2. If we divided by 3, this means we multiplied x by 3 to begin with. Since division undoes multiplication
    So we have the start equation:
    3x - 7

    If the answer was x = -4, then we plug this in to get our number on the right side of the equation:
    3(-4) - 7
    -12 - 7
    -19

    This means our original equation was:
    3x - 7 = -19

    And if we want to solve this to prove our answer, we type the equation into our search engine and we get:
    x = -4
     

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