Math Please

My questin is If r=5z then 15z=3y, then r=
I just can't seem to determine how to set this problem up. I tried subsutition but that doesn't work for me either? Thanks in advance

I assume you want to define r in terms of y.

If r = 5z, then 3r = 15z.

Therefore, 3r = 3y.

I'm sure you can take it from there. I hope this helps. Thanks for asking.

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