A. There is no coefficient of X.
Answer:
the answer is x=y/9 + XZ/9
Step-by-step explanation:
Isolate the variable by dividing each side by factors that don't contain the variable.

Step-by-step explanation:
The equation we are given is the following:

A proportion is a relationship between two ratios. This tells us that two ratios are equal. That is, suppose you have two ratios:

Then, we can write a proportion as follows:

For:

If you divide both sides by (3)(9):

<h2>Learn more:</h2>
Constant of proportionality: brainly.com/question/13742796#
#LearnWithBrainly
Part one of your questions would be 1/20
Part two would be 1/20
Part three. Yes they are equal
Part four. None of them sense there equal
The answer is 21% I hope this helps