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When x+3y<9 is written in terms of y, which form is obtained?

Answer and explanation

Correct answer: y<3-x/3

The governing algebraic rule is to isolate y while preserving the inequality direction. Starting with x+3y<9, subtract x from both sides: 3y<9-x. Then divide by the positive number 3, so the inequality sign does not reverse: y<(9-x)/3=3-x/3. Therefore option A is correct. Option B reverses the sign without justification; a reversal would occur only when dividing or multiplying by a negative number. Option C fails to divide both terms on the right by 3 and also changes the coefficient incorrectly. Option D has both an incorrect sign pattern and an incorrect constant. This rearranged form is useful for graphing: the boundary is y=3-x/3, and because the original sign is strict, the boundary is drawn dashed and the region below it is selected.

Related tags

Linear InequalitiesAlgebraic RearrangementGraphingGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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