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r = 5z
?r = 15z
?r = 15z = 3y

please explain.

One min..

It's A. let me explain

You got \[r=5z; 15 z=3y\]

So what you wanna find is what r is in terms of y

r=5z and 15z=3y so the conclution from that is that 5z is 1/3 of 15z, right?

That means that r=5z=y

so final answer is "A"?

Another formulation: you know that 15z=3y and you want to find 5z

Exactly

Do you get it? :)

You can also set it as an equationsystem

yeap got it. thank you.

np

\[r=5z \]
\[z=\frac{r}{ 5 }\]
\[15z=3y\]
\[15\frac{ r }{5 }=3y\]
\[3r=3y\]
\[r=y\]