Answer:
Step-by-step explanation:
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The graph of f(x) = x in a straight line passing through the origin (0,0) and at an angle of 45 degrees to the x axis. It increases from left to right.
Reflection in the x axis will convert all positive values of f(x) to negative values of f(x) and vice versa.
g(x) = - x and is a striaght line passing through origin at angle of 45 degrees but the slope descends from left to right.