Question

Prove that f(0) = 0.

Answer 1

for what function ?

Answer 2

f(x + y) = f(x) + f(y) from R to R

Answer 3

any more info on this function. Maybe like it is eaven?

Answer 4

f is defined from the reals to the reals for all x,y in the reals

Answer 5

f(0+y)=f(0)+f(y)
or
f(y)=f(0)+f(y)
so f(0) have to equal 0