## rambo2210 Group Title If r = 5 z then 15 z = 3 y, then r = (A) y (B) 2 y (C) 5 y (D) 10 y 2 years ago 2 years ago

1. nphuongsun93

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

2. rambo2210

3. rambo2210

@frx can you please solve this?

4. frx

One min..

5. frx

It's A. let me explain

6. frx

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

7. frx

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

8. frx

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

9. frx

That means that r=5z=y

10. rambo2210

11. frx

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

12. frx

Exactly

13. frx

Do you get it? :)

14. frx

You can also set it as an equationsystem

15. rambo2210

yeap got it. thank you.

16. frx

np

17. frx

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