Help pls for brainlest?

Can someone answer these problems for me

Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

Write an equation of the line that passes through the point (2, 3) and is perpendicular to the line x = -1. a) y = 1 b) y = 3 c) y = 0 eliminate d) y = -3