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What is the number of solutions of (2x+3y=11) and (4x+6y=22)?

Answer and explanation

Correct answer: Infinitely many solutions

The second equation is exactly twice the first: multiplying every term of \(2x+3y=11\) by 2 gives \(4x+6y=22\). Thus the two equations are not two different lines. They describe the same straight line, so every point on that line satisfies both equations. A pair of coincident linear equations has infinitely many solutions, not one or two.

To see this algebraically, divide the second equation by 2. It becomes \(2x+3y=11\), identical to the first equation. There is therefore only one independent condition for two variables. For example, choosing any suitable value of x determines a corresponding y, and all such pairs lie on the same line. Hence option A, infinitely many solutions, is correct. “No solution” would apply when parallel distinct lines are represented.

Related tags

Linear EquationsDependent EquationsInfinite SolutionsHardClass 10

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