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What are 2 similarities that identity function and absolute function have?

This is just a simple question that I can't figure out. Help me please!

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Peter H. | Tutoring in Math, Science, and Computer EngineeringTutoring in Math, Science, and Computer ...
Hi Yenna,
I'll denote the two functions as fi for identity, and fa for absolute value. The identity function is fi(x) = x. The absolute value function is fa(x) = |x|.
1) For x<0, fi(x) = x; for example fi(-2) = -2. However, fa(x) = -x; for example fa(-2) = |-2| = 2. We see that fi has a slope of +1, and fa has a slope of -1. Therefore, the similarity is that the magnitude (that is, absolute value) of the slopes is the same.
2) For x ≥ 0, ...
Yenna, I'll let you finish the second similarity. Good luck !