Answer:
B (r= 1/6s)
Step-by-step explanation:
If you just work out each option, you'll see that "s" multiplied by 1/6 gets r.
Subtract the second equation from double the first equation:
2x+6y-2x-(-4y)=0
10y=0
Therefore, y=0. Substituting this into the first equation, we see that:
x+3(0)=3
x=3
Therefore, x=3. The solution to this system is x=3, y=0, or (3, 0).