Step-by-step explanation:

f (x) = 3/4 x + 6

g (x) = -1/2 x

(f + g)(x)

= 3/4 x + 6 + (-1/2 x)

= 1/4 x + 6

(f - g)(x)

= 3/4 x + 6 - (-1/2 x )

= 5/4 x + 6

I hope this helps