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Answers for “在绘制不等式时,什么时候应该使用实线,什么时候应该使用虚线?”

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To graph y≤2y \le 2, first draw a horizontal boundary line at y=2y = 2. Make the line solid because the inequality includes equality.

Conditions: The inequality restricts only one variable (y).; The inequality is non-strict (≤).