exam Maths Puzzle Numerical Ability

4 - 5(y - 2) > or equal to -2(-9 + 2y)

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Hi, can you help,
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Greatest Integer Function
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I asked a question a few minutes ago
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I was taught that if it was (-2.1) it would be (-3)(one to the left of it) can you please confirm
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Thanks ahead of time, Levi Tell wether the ordered pair is a solution of the linear system.

(1,-1);
2x - y = 3
4x + 2y = 2

Any help with this equation would be Greatly</b> appreciated.