book Maths Puzzle Numerical Ability

Please help me understand this problem 1.5+2.1y<1.1y+4.5

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book Other Question

1) Determine the x and y intercepts of 3x-y=9.
Explain how you got it.

2)a) find the x and y intercepts for 3x=4y=12 and 2x=3y=9
b) use the intercepts to graph the system an Suppose you inscribe a square inside a circle with radius r. All four corners of the square are in the circle. The area of that square is what?