why does TC and TFC curve start from the same point of the origin - Economics - Production and Costs

Question

why does TC and TFC curve start from the same point of the origin?

Gurdeep Singh Bhatia · Answer

TC and TFC start from the same point because when zero unit of
output is produced, TVC is zero
We know that,
TFC + TVC = TCTC
When Output = 0 unit,
TFC + 0 = TC
TFC = TC