exam Maths Puzzle Numerical Ability

4. If f and g are linear functions with graphs that are perpendicular, show that the slopes of the graphs of f-g and g-f are both -1.

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I really need help here. I need this answer like right now,
2) Is (sqrt x)^2=x an identity (true for all nonnegative values of x)? It is due in less than 30 min, please help me Translate the linear equation 9x - 4y = 200 and 7x - 3y = 200 to a real-life situation