graphic pairs function in the same set of axis (1 quadrant)

Question

g(x)=3/7x+6&h(x)=3/7-3

Answer 1

you can play around here, and see how things work:

http://www.wolframalpha.com/input/?i=plot+3%2F7+x+%2B+6,+3%2F7x-3

Answer 2

If you meant:
g(x)=3/(7x+6) and h(x)=3/(7x-3)

the curves look a bit more interesting.

http://www.wolframalpha.com/input/?i=plot+y+%3D3%2F(7x%2B6)+,+y+%3D3%2F(7x-3)