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Which inequality gives the region below the line (y=3) without including the line?

Answer and explanation

Correct answer: (y<3)

The line \(y=3\) divides the plane into points above it and points below it. “Below” means that the y-coordinate is smaller than 3, so the basic inequality is \(y<3\). The phrase “without including the line” means equality is not allowed. Consequently, the required inequality is \(y<3\), which is choice D.

If the line itself were included, the correct sign would be \(\leq\), because points with y=3 would also belong to the region. The sign \(y>3\) describes the region above the line, while \(y\geq3\) includes the line and also describes the upper side. On a graph, \(y=3\) is drawn as a horizontal dashed line for the strict inequality, and the region below it is shaded.

Related tags

Linear InequalitiesHorizontal LineStrict InequalityBelow Line

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