book Maths Puzzle Numerical Ability

I wanted to know how to solve x-1 is less than or equal to 2x+4 which is less than or equal to 3x-1. Thank you

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What is the equation in standard form y=mx =c

To Y-3x + 1=




AND THEN what is the y-intercept of the equation? how do I figure out this type of problem 4 is what percent of 5?