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What is the slope of the boundary line of (y\le -2x+7)?

Answer and explanation

Correct answer: (-2)

The boundary line of an inequality is found by replacing the inequality sign with an equality. Thus the boundary of \(y\leq-2x+7\) is \(y=-2x+7\). A line written in slope-intercept form is \(y=mx+c\), where m is the slope and c is the y-intercept. Comparing the two equations gives \(m=-2\), so option C is correct.

The negative slope means that the line falls as x increases: when x moves one unit to the right, y decreases by 2 units. The number 7 is the y-intercept, not the slope. Likewise, -7 is not relevant, and 2 misses the negative sign. The inequality symbol determines which side is shaded, but it does not change the slope of the boundary line.

Related tags

Linear InequalitiesSlopeBoundary LineClass 11

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