anonymous
  • anonymous
If r = 5 z then 15 z = 3 y, then r = (A) y (B) 2 y (C) 5 y (D) 10 y
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
r = 5z ?r = 15z ?r = 15z = 3y
anonymous
  • anonymous
please explain.
anonymous
  • anonymous
@frx can you please solve this?

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anonymous
  • anonymous
One min..
anonymous
  • anonymous
It's A. let me explain
anonymous
  • anonymous
You got \[r=5z; 15 z=3y\]
anonymous
  • anonymous
So what you wanna find is what r is in terms of y
anonymous
  • anonymous
r=5z and 15z=3y so the conclution from that is that 5z is 1/3 of 15z, right?
anonymous
  • anonymous
That means that r=5z=y
anonymous
  • anonymous
so final answer is "A"?
anonymous
  • anonymous
Another formulation: you know that 15z=3y and you want to find 5z
anonymous
  • anonymous
Exactly
anonymous
  • anonymous
Do you get it? :)
anonymous
  • anonymous
You can also set it as an equationsystem
anonymous
  • anonymous
yeap got it. thank you.
anonymous
  • anonymous
np
anonymous
  • anonymous
\[r=5z \] \[z=\frac{r}{ 5 }\] \[15z=3y\] \[15\frac{ r }{5 }=3y\] \[3r=3y\] \[r=y\]

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