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What is the correct conclusion for the lines (9x-5y=13) and (18x-10y=26)?

Answer and explanation

Correct answer: Infinitely many solutions

Two linear equations represent the same line when every coefficient and the constant in one equation is multiplied by the same nonzero number to obtain the other equation. In that case, every point on the line satisfies both equations, so the pair has infinitely many solutions. Therefore option C is correct. The equations do not represent two separate intersecting lines.

Multiplying the first equation by 2 gives \(2(9x-5y)=2(13)\), which is \(18x-10y=26\), exactly the second equation. Thus the two equations are dependent and describe coincident lines. Every solution of the first is also a solution of the second, giving infinitely many ordered pairs rather than one, none, or exactly two solutions.

Related tags

Class10Linear-EquationsSolvability

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