Posted by **john** on Tuesday, October 13, 2009 at 7:53pm.

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 -
**Ms. Sue**, Tuesday, October 13, 2009 at 7:55pm
Doesn't x = 2? Substitute 2 for x.

Doesn't 7 + 2 = 7?

- math -
**john**, Tuesday, October 13, 2009 at 7:57pm
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 -
**jim**, Tuesday, October 13, 2009 at 7:57pm
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 -
**jim**, Tuesday, October 13, 2009 at 8:01pm
Oh.

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

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