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For 12x + 18y = 54 and 2x + 3y = c to have no solution, which value of c is correct?

Answer and explanation

Correct answer: 10

A pair of linear equations has no solution when the equations represent distinct parallel lines. Simplify the first equation by dividing every term by 6: 12x + 18y = 54 becomes 2x + 3y = 9. The second equation is 2x + 3y = c, which has exactly the same left-hand side. If c = 9, the equations are identical and therefore have infinitely many solutions, not no solution. If c differs from 9, the same expression 2x + 3y would have to equal two different constants, 9 and c, which is impossible. Geometrically, the lines are parallel but distinct. Among the choices, only c = 10 is different from 9 and therefore produces no solution. Option C is correct.

Related tags

Pair-Of-Linear-EquationsConditions-For-SolvabilityNo-SolutionParallel-LinesConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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