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What is the value of (b) for the equations (bx+12y=48) and (10x+30y=101) to have no solution?

Answer and explanation

Correct answer: 4

For two linear equations to have no solution, the condition is \(\frac{a_1}{a_2}=\frac{b_1}{b_2}\neq\frac{c_1}{c_2}\). Here, \(\frac{b}{10}=\frac{12}{30}=\frac{2}{5}\), so \(b=4\). Also, \(\frac{48}{101}\neq\frac{2}{5}\), so the two lines are parallel and inconsistent. Exam tip: first equate the ratios of the coefficients of x and y, then verify that the ratio of the constant terms is different.

Related tags

Linear EquationsTwo VariablesConditions For SolvabilityNo SolutionParameterPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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