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Question

How can you tell whether an ordered pair is a solution of a linear inequality?

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Answered 2 years ago
Answered 2 years ago
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To verify this statement you can substitute the pair at both sides of the inequality. The inequality holds for this pair if and only if the pair is one of its solutions. For example, let us consider the inequality

y2x1y \geq 2 x-1

The pair (0,0)(0,0) is a solution of the inequality, because

y2x1Write the inequality 0?2(0)1Replace x and y by 001True conclusion\begin{align*} y &\geq 2 x-1 && \text {Write the inequality } \\ 0 &\stackrel{?}{\geq} 2(0)-1 && \text {Replace } x \text { and } y \text { by } 0 \\ 0 & \geq-1&&\text{True conclusion} \end{align*}

Nevertheless, (0,2)(0,2) is not a solution of the inequality, because

y2x1Write the inequality 0?2(2)1Replace x by 0 and y by 203False conclusion\begin{align*} y &\geq 2 x-1&&\text {Write the inequality } \\ 0 &\stackrel{?}{\geq}2(2)-1&& \text {Replace } x \text { by } 0 \text{ and }y \text { by }2 \\ 0 &\geq 3&&\text{False conclusion} \end{align*}

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