exam Maths Puzzle Numerical Ability

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

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exam Other Question

The point (2, -5) is a solution to which of the following equations?
y = -3x + 1

y = -3x - 5

y = -3x - 3

y = -3x + 5
4 - 5(y - 2) > or equal to -2(-9 + 2y)