rambo2210
If r = 5 z then 15 z = 3 y, then r =
(A) y
(B) 2 y
(C) 5 y
(D) 10 y



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nphuongsun93
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r = 5z
?r = 15z
?r = 15z = 3y

rambo2210
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please explain.

rambo2210
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@frx can you please solve this?

frx
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One min..

frx
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It's A. let me explain

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

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

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

frx
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That means that r=5z=y

rambo2210
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so final answer is "A"?

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

frx
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Exactly

frx
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Do you get it? :)

frx
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You can also set it as an equationsystem

rambo2210
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yeap got it. thank you.

frx
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np

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