I was given a problem 9x

---
15x
I was told to simplify, I got 3y
--
5
I was told that was wrong. Is it and why?

Where is the y in the problem?

sorry the why was in the numerator it was 9xy

---
15x

9xy/15x

Divide numerator and denominator by 3x.

3y/5

If there are no more typos, I can't understand why your answer is wrong.

To determine whether your simplification is correct, we need to simplify the given expression and compare it to your answer.

The expression 9x/15x can be simplified by canceling out the common factor of x in the numerator and denominator. This leaves us with:

9/15

To simplify further, we can divide the numerator and denominator by their greatest common divisor, which is 3. This yields:

3/5

Therefore, the simplified form of 9x/15x is 3/5.

Now let's compare this to your answer of 3y/5. Here, you introduced a new variable, 'y,' which was not present in the original expression. This means that your answer is incorrect because you altered the expression by introducing a new variable that was not originally there.

To simplify the original expression correctly, we need to cancel out the common factor of 'x' only, without introducing any new variables. Hence, 3y/5 is not a valid simplification for 9x/15x.