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What is the value of (m) for no solution in (4x+my=8) and (10x+15y=21)?

Answer and explanation

Correct answer: (m=6)

The direct answer is option C, m=6. For two equations to have no solution, their coefficient ratios must be equal but their constant ratio must be different: \(a_1/a_2=b_1/b_2\ne c_1/c_2\). Here \(4/10=2/5\). Set \(m/15=2/5\): multiplying by 15 gives \(m=6\). The constant ratio is \(8/21\), which is not \(2/5\), so the lines are parallel and distinct. Option A, m=4, gives \(4/15\), so the coefficient ratios are not equal. Option B, m=5, gives \(1/3\), also not equal to \(2/5\). Option C gives equal coefficient ratios but unequal constants, so it is correct. Option D, m=8, gives \(8/15\), again wrong. Memory cue: no solution means parallel lines: coefficients proportional, constants not proportional.

Related tags

Class10Linear-EquationsSolvability

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