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What is found by comparing the ratios of (a) and (b) in the equations (13x+8y=47) and (6x+4y=23)?

Answer and explanation

Correct answer: (13/6 \ne 8/4), so one unique solution

A pair of linear equations has one unique solution when the ratios of the coefficients of x and y are unequal. Geometrically, this means the corresponding lines have different slopes, so they cross at one point. If both variable ratios were equal, the constant ratio would then distinguish coincident lines from distinct parallel lines.

Here, \\(13/6\\) is approximately \\(2.167\\), while \\(8/4=2\\). Therefore \\(13/6\\ne8/4\\). The lines have different slopes and must intersect exactly once. The constant terms do not need further comparison for this classification. Hence the system has one unique solution, and option C is correct.

Related tags

Linear EquationsHardRatio ComparisonUnique Solution

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