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Which statement is correct by observing the equations (21x+8y=97) and (42x+16y=194)?

Answer and explanation

Correct answer: Lines are the same

Multiply the first equation by 2: 2(21x+8y=97) gives 42x+16y=194, which is exactly the second equation. Hence the two equations are dependent and represent the same straight line. Every point on this common line satisfies both equations, so the pair has infinitely many solutions. Option A and option D describe distinct parallel lines, while option C would require non-proportional coefficients.

Related tags

Class10Linear-EquationsCoincident-LinesSolvabilityConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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