In the least-squares line  = 5 – 9x, what is the value of the slope? When x changes by 1 unit, by how much does y change? When x increases by 1 unit, y decreases by 9 units. When x decreases by 1 unit, y decreases by 9 units.     When x increases by 1 unit, y decreases by −9 units. When x increases by 1 unit, y increases by 9 units.

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