proof help?

Question

proof help?
Let f : R to R be a function such that f(x+y) = f(x) + f(y) for x*y ЄR.
a)Prove that f(0) = 0
b)Prove that f(n) = nf(1) for all n Є N.

Note:
R = Real numbers
f = function
N = natural numbers

Answer 1

Oh My Stars, I thought you wanted proofing on something like an essay. I'm terrible with math.