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Choose the correct conclusion for (x+5y=12) and (3x+14y=31).

Answer and explanation

Correct answer: One unique solution

The direct answer is option D: one unique solution. Compare the coefficients of the equations \(x+5y=12\) and \(3x+14y=31\). We have \(a_1/a_2=1/3\) and \(b_1/b_2=5/14\). These are unequal, so the lines have different slopes and intersect at exactly one point. Option A, no solution, would require distinct parallel lines, represented by equal coefficient ratios but a different constant ratio. Option B, infinitely many solutions, and option C, coincident lines, describe the same situation: both equations represent one line, so all three ratios would be equal. They are not equal here. For an additional check, multiply the first equation by 3: \(3x+15y=36\). Comparing it with \(3x+14y=31\) shows the equations are not identical; subtracting gives \(y=5\), then \(x=-13\), confirming one solution. Thus D is correct.

Related tags

Linear EquationsUnique SolutionIntersecting Lines

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