## anonymous 4 years ago If r = 5 z then 15 z = 3 y, then r = (A) y (B) 2 y (C) 5 y (D) 10 y

1. anonymous

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

2. anonymous

3. anonymous

@frx can you please solve this?

4. anonymous

One min..

5. anonymous

It's A. let me explain

6. anonymous

You got $r=5z; 15 z=3y$

7. anonymous

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

8. anonymous

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

9. anonymous

That means that r=5z=y

10. anonymous

11. anonymous

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

12. anonymous

Exactly

13. anonymous

Do you get it? :)

14. anonymous

You can also set it as an equationsystem

15. anonymous

yeap got it. thank you.

16. anonymous

np

17. anonymous

$r=5z$ $z=\frac{r}{ 5 }$ $15z=3y$ $15\frac{ r }{5 }=3y$ $3r=3y$ $r=y$