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

1. y
2. 2 y
3. 5 y
4. 10 y
5. 15 y

Multiply the first equation by 3

3r=15z

which means 3r=3y, which means r=....

Now I get it. Haha, I've been trying to solve this for hours.

To solve this problem, we need to do some algebraic manipulation.

Given that r = 5z and 15z = 3y, we can substitute the value of r into the second equation to find the value of y.

Substituting r = 5z into the equation 15z = 3y, we get:

15z = 3(5z)
= 15z

Now we have an equation with only z. We can cancel out the z on both sides:

15z ÷ 15 = 15z ÷15
z = z

This equation implies that z can be any value and does not provide any specific information about y or r. Therefore, we cannot determine the value of r based on the given equations.

So, the answer is none of the options given (1. y, 2. 2y, 3. 5y, 4. 10y, 5. 15y).