exam Maths Puzzle Numerical Ability

What is the equation of the x-axis?

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I am having trouble with this question, can you help? This is needed for my class. Thanks

Describe at least two real-life examples where inequalities are used either at home or Q1. |z|<6

Q2. |x|<= -7

Q3. -3+ |5x-2| <4

Q4. |8x+3|>0