book Maths Puzzle Numerical Ability

how would you graph |x+1|=y? what does the | | mean?

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book Other Question

I need help in factoring this:
a^2 + 7a + 6 Give an example of a function related to your body's physiology or your life's events. Is this function linear or not? How different would it be for other people? [Hints: Do not in