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If (cx+18y=72) and (24x+48y=145) have no solution, what will (c) be?

Answer and explanation

Correct answer: 9

For a pair of linear equations to have no solution, the ratios of the coefficients of x and y must be equal, but this ratio must differ from the ratio of the constants: \(\frac{a_1}{a_2}=\frac{b_1}{b_2}\ne\frac{c_1}{c_2}\). Here, \(\frac{c}{24}=\frac{18}{48}=\frac{3}{8}\), so \(c=9\). Also, \(\frac{72}{145}\ne\frac{3}{8}\), confirming that the lines are distinct and parallel. Exam tip: First equate the ratios of the x- and y-coefficients to find the parameter, then verify the constants’ ratio.

Related tags

Linear EquationsSolvability ConditionsParameterNo SolutionClass 10 MathematicsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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