Which line is a graph of a proportional relationship? Explain. 50 50 40 40 30 30 b 20 20 10 10 please help I will have BRAINLESS

Answer:
Step-by-step explanation:
Proportional relationship:
It passes through the origin, point (0, 0) regardless the value of k.
We see line a doesn't but line b does passes through the origin, so it is the one we need.