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For 4x + 6y = 10 and 2x + 3y = k to have no solution, what should k not be?

Answer and explanation

Correct answer: 5

For two linear equations, no solution occurs when the ratios of the coefficients of x and y are equal but the ratio of the constants is different. Here, 4/2 = 2 and 6/3 = 2, while the constant ratio is 10/k. If 10/k = 2, then 10 = 2k and k = 5. At k = 5, multiplying the second equation by 2 gives 4x + 6y = 10, so both equations represent the same line and have infinitely many solutions, not no solution. Therefore k must not be 5, making option A correct. For k = 6, 8, or 10, the lines have equal coefficient ratios but unequal constants after comparison, so they are distinct parallel lines with no common solution.

Related tags

Conditions-Of-SolvabilityNo-SolutionLinear-EquationsPair Of Linear Equations In Two VariablesConditions For SolvabilityMathematicsClass 10 Mcq

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