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By observing the equations 18x + 5y = 79 and 36x + 10y = 158, which statement is correct?

Answer and explanation

Correct answer: The lines are the same

Multiply the first equation, 18x + 5y = 79, by 2. It becomes 36x + 10y = 158, exactly the second equation. Thus both equations have the same graph and represent one coincident line. The phrase “the lines are the same” is therefore the most precise statement; such a pair has infinitely many solutions. Distinct parallel lines would have proportional x and y coefficients but a different constant ratio, while intersecting lines would not have proportional coefficients.

Related tags

Linear EquationsSame LineCoincident LinesSolvabilityConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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