Wednesday

July 30, 2014

July 30, 2014

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

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 7:55pmDoesn't x = 2? Substitute 2 for x.

Doesn't 7 + 2 = 7?

- math -
**john**, Tuesday, October 13, 2009 at 7:57pmWe'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 7:57pmThe 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 8:01pmOh.

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

**Related Questions**

Science - Proof of Propositional Logics - I am being asked if I can prove P, L, ...

Very easy math - my teacher told me that the inverse of addition was subtraction...

RESEARCH REPORT - HI I WOULD LIKE TO KNOW WHAT I CAN POSSIBLY PROVE ABOUT EITHER...

Geometry - Can you just help me with this thanks Directions: Tell which property...

history - I'm supposed to prove that if america stopped getting involved in the ...

math - Use the Generalized PMI to prove: 2^n > n^2, for all n > 4 First of...

math - I need to prove my answer is correct, the directions say to simplify the ...

math - Let f:A->B, where A and B are nonempty, and let T1 and T2 be subsets ...

College Math : Linear Algebra - Suppose A is a square matrix satisfying the ...

math - My math teacher gave me this problem: Prove the validity of cross ...