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## Homework Statement

If f,g are Riemann integrable on [a,b], then for c,d real numbers,

(let I denote the integral from a to b)

I (cf + dg) = c I (f) + d I (g)

## Homework Equations

## The Attempt at a Solution

I have the proofs for

c I(f) = I (cf)

and

I (f+g) = I (f) + I(g)

I'm wondering how would I put them together to prove the statement?

Can I just say that because I know these 2 propositions are true, then any linear combination would also work?