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What type of pair is formed by the lines (7x+2y=9) and (21x+6y=25)?

Answer and explanation

Correct answer: Inconsistent

The direct answer is option C: inconsistent. Compare the two equations. The second equation has coefficients three times those of the first: \(21=3\times7\) and \(6=3\times2\). If its constant were also three times 9, it would be 27. Instead, it is 25. Thus the coefficient ratios are equal, \(7/21=2/6=1/3\), but the constant ratio is different, \(9/25\ne1/3\). Therefore the lines have the same slope but different intercepts; they are distinct parallel lines and have no common solution. Option A is wrong because equal coefficient ratios do not give an independent intersection. Option B is wrong because dependent lines require the constant ratio to match too. Option C is correct. Option D is wrong because no pair is always unique merely from these coefficients; in fact this pair has no solution. Exam cue: equal coefficient ratios plus unequal constant ratio means inconsistent.

Related tags

Class10Linear-EquationsSolvability

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