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If the boundary line (ax+2y=12) has (x)-intercept ((3,0)), what is the value of (a)?

Answer and explanation

Correct answer: 4

At the x-intercept, y=0. Substituting the given point (3,0) into the boundary line ax+2y=12 gives 3a+2(0)=12, so 3a=12. Hence, a=4. If a were 6, the x-intercept would be 12/6=2, not 3. Exam tip: for an x-intercept, always set y=0.

Related tags

Linear InequalitiesX-InterceptBoundary LineCoordinate GeometryLinear EquationsGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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