Multiply the first equation by 3
3r=15z
which means 3r=3y, which means r=....
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
2 answers
Now I get it. Haha, I've been trying to solve this for hours.