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What type of lines are 12x + 15y = 30 and 4x + 5y = 10?

Answer and explanation

Correct answer: Coincident

The governing concept is the ratio test for a pair of linear equations. Put both equations in standard form: 12x + 15y − 30 = 0 and 4x + 5y − 10 = 0. Their corresponding ratios are a1/a2 = 12/4 = 3, b1/b2 = 15/5 = 3, and c1/c2 = (−30)/(−10) = 3. Because all three ratios are equal, the equations represent the same line rather than two separate lines. Consequently, every point common to one equation is also common to the other, giving infinitely many solutions. Hence option C, coincident lines, is correct. If only the first two ratios had matched while the constant ratio differed, the lines would have been distinct parallel lines.

Related tags

Coincident LinesRatio TestPair Of Linear EquationsInfinite SolutionsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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