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What is the correct ratio relation for 4x − 5y + 7 = 0 and 8x − 10y + 9 = 0?

Answer and explanation

Correct answer: 4/8 = (−5)/(−10) ≠ 7/9

For two equations a₁x + b₁y + c₁ = 0 and a₂x + b₂y + c₂ = 0, the relation a₁/a₂ = b₁/b₂ ≠ c₁/c₂ indicates distinct parallel lines and no solution. Here, 4/8 = 1/2. Also, (−5)/(−10) = 1/2, so the first two ratios are equal. However, 7/9 is not equal to 1/2, so the constant-term ratio is different. Therefore the correct relation is 4/8 = (−5)/(−10) ≠ 7/9, which is option A. The equal first two ratios show equal direction or equal slope, while the unequal constant ratio shows that the lines are distinct rather than coincident. Option C would represent coincident lines and infinitely many solutions.

Related tags

Linear EquationsRatio RelationParallel LinesNo SolutionConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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