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When will (11x+2y=3) and (22x+ny=8) have a unique solution?

Answer and explanation

Correct answer: (n\neq4)

The direct answer is A: n is not equal to 4. For two linear equations, a unique solution requires the lines not to be parallel or coincident. Using the coefficient test, we need \(11/22\ne2/n\). Since \(11/22=1/2\), equality would mean \(1/2=2/n\), so n=4. Therefore every value except n=4 gives a unique solution. If n=4, the first two coefficient ratios are equal, while the constant ratio is \(3/8\), not equal to 1/2; the lines are parallel and there is no solution. Option A states exactly the required condition. Options B, C and D give particular values n=4, 2 and 8; B is the exceptional no-solution value, while C and D do give unique solutions but are not the complete condition. Exam cue: state the full restriction, not just one example.

Related tags

Class10Linear-EquationsSolvability

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