The graph of the function g(x) = 5x is the line y = g(x) = 5x.
To determine the inverse of g(x) let y = g(x) = 5x. Now isolate x
=> x = y/5
Interchange x and y
=> y = x/5
=> `g^-1(x) = x/5`
The graph of the inverse function is y = x/5.
The graph of the functions has been plotted below, the function g(x) = 5x is in red and its inverse is in green
For g(x), its is simply a line with a slope of 5, that has a y intercept of 0. For every x value, multiply by 5 for the coresponding y value. For its inverse, g^-1(x), simply interchange the the domain (x values) and range (y values) with each other. This is essentially just making it 1/5x.