book Maths Puzzle Numerical Ability

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)?

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book Other Question

. Fill in the chart given this linear equation:
2x + y = 42.

x y
-2
-1
0
1
2 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