Help me please tell me the right answer too this test means a lot to me :(

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1

Examine this system of equations. what integer should the second equation be multiplied by so that when the two equations are added together, the x term is eliminated? 3/4x+1/7y=6 1/8x-3/5y=16