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For (9x+15y=45) and (kx+5y=18) to have no solution, what is the value of (k)?

Answer and explanation

Correct answer: (k=3)

Two linear equations have no solution when they represent distinct parallel lines. For equations \(a_1x+b_1y+c_1=0\) and \(a_2x+b_2y+c_2=0\), this occurs when the coefficients of \(x\) and \(y\) are proportional but the constants are not proportional. Such lines have the same slope but different positions.

Divide the first equation by 3: \(3x+5y=15\). If \(k=3\), the second equation becomes \(3x+5y=18\). The left sides are identical, but the right sides differ, so one pair cannot satisfy both equations. The lines are distinct and parallel, and there is no common solution. Therefore option B is correct.

Related tags

Linear EquationsNo SolutionParameterExpertClass 10

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