book Maths Puzzle Numerical Ability

For Each function (f), find (f)-1 and the domain and range of (f) and (f)-1 . determine whether (f)-1 is a function.

23. f(x)= 3x+4

** im really not sure of where to start on

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book Other Question

HOW IS THIS DONE?

WHAT IS THE SLOPE OF A LINE THAT IS PERPENDICULAR TO THE LINE PASSING THROUGH THE POINTS (8,3) AND (10,6)?
3x-6y=9 You have to solve for x and y. Then graph the two points on a graph. Then name the slope and y intercept.

Thanks in advance