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What is the number of solutions of (3x+5y=20) and (6x+10y=40)?

Answer and explanation

Correct answer: Infinitely many solutions

The second equation is obtained by multiplying every term of the first equation by 2: \(2(3x+5y=20)\) gives \(6x+10y=40\). Multiplying an equation by a nonzero number does not create a new line; it produces an equivalent equation with exactly the same solutions. Therefore both equations represent one coincident line.

Because the two equations are identical in meaning, every point satisfying \(3x+5y=20\) satisfies the second equation as well. There are infinitely many such points: choosing different x-values gives corresponding y-values, such as \(y=(20-3x)/5\). The system does not force a single point, and it is not contradictory. Hence option A, infinitely many solutions, follows. A no-solution result would require unequal constant ratios for otherwise proportional coefficients.

Related tags

Linear EquationsDependent EquationsInfinite SolutionsHardClass 10

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