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If (\frac{a_1}{a_2}\ne\frac{b_1}{b_2}), which statement is correct in graphical method?

Answer and explanation

Correct answer: There is exactly (1) solution

The direct answer is C: there is exactly one solution. For two lines \(a_1x+b_1y+c_1=0\) and \(a_2x+b_2y+c_2=0\), unequal ratios \(\frac{a_1}{a_2}\ne\frac{b_1}{b_2}\) mean their direction slopes are different. Lines with different slopes cannot remain parallel or identical; they meet at one and only one point. Therefore the pair is consistent and independent and has exactly one solution. Option A, no solution, applies to distinct parallel lines, usually when \(\frac{a_1}{a_2}=\frac{b_1}{b_2}\ne\frac{c_1}{c_2}\). Option B, infinitely many solutions, applies to coincident lines, when all three ratios are equal. Option C is correct. Option D is wrong because unequal coefficient ratios do not make lines identical; identical lines require matching ratios. Exam cue: compare the first two ratios. Unequal means one intersection; equal first two ratios require checking the constant ratio.

Related tags

Unique SolutionRatio TestIntersecting Lines

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