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My math teacher wants us to prove that all of our answers are correct.
But how am I supposed to be able to prove stuff, like this, for example.
The directions want you to write out the words in to an equation.
Seven is the sum of X and 5.
so my answer is 7= x +5
How would I prove my answer?

  • math -

    Doesn't x = 2? Substitute 2 for x.

    Doesn't 7 + 2 = 7?

  • math -

    We're not supposed to figure out what the variable is.
    The direction for the question was to write out the sentence in an equation

  • math -

    The question wants you to figure out what number replaces X.

    7 = x + 5
    7 = ? + 5.

    What number replaces x, or the question-mark? You're going to write:

    x = (some digit, which is your answer)

    Proving is easy. Just write
    7 = x + 5 down again, but this time replacing x with your answer.

  • math -


    If it's any comfort, I have no idea how writing sentences embodying equations could be proven, either.

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