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 questionmark? 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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