I don’t understand lol

Answer:
3*r = 3
Step-by-step explanation:
[tex]\dfrac{24}{r}=3\\\\24 = r*3\\\\\dfrac{24}{3}=r\\\\6 = r[/tex]6 is a solution.
[tex]3*r=3\\\r =\dfrac{3}{3}\\\\r = 1\\[/tex]
6 is not a solution.
[tex]7r = 42\\\\r =\dfrac{42}{7}\\\\r = 6[/tex]
6 is a solution
Answer:
My best answer is A
Step-by-step explanation:
if you plug in 6 for r, it doesn't work for A.
B is hard to see so can't tell
C works with r=6, so it's not C
and D works as well, so it's not D