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What is the correct conclusion for (2x+3y=12) and (4x+6y=24)?

Answer and explanation

Correct answer: Infinitely many solutions

The direct answer is option B: infinitely many solutions. Compare the equations: multiplying 2x+3y=12 by 2 gives 4x+6y=24, exactly the second equation. Therefore the two equations are not two different lines; they are the same line written in different forms. Every point on that line satisfies both equations, so there are infinitely many ordered pairs, not just one pair. Option B is correct. Option A, no solution, would occur when the left-side coefficients are proportional but the constants are not proportional, producing parallel different lines. That does not happen here. Option C, exactly one solution, occurs when the two lines intersect once; here they coincide. Option D, two different solutions, is not the standard result for two linear equations representing the same line; in fact there are infinitely many. Memory cue: if one complete equation is a non-zero multiple of the other, write “infinitely many solutions.”

Related tags

Linear EquationsDependent EquationsEliminationMediumClass 10

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