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If both equations give the same line in a graph then how many solutions will the pair have?

Answer and explanation

Correct answer: Infinitely many solutions

The direct answer is D: infinitely many solutions. A pair of linear equations represents two lines. If both equations give exactly the same line, every point on that line satisfies the first equation and also the second equation. Since a line contains infinitely many points, the pair has infinitely many ordered-pair solutions. Option A, one solution, is wrong because one solution occurs when two different lines meet at exactly one point. Option B, no solution, is wrong because parallel distinct lines never meet. Option C, three solutions, is wrong because two linear equations cannot have exactly three intersection points. Option D is correct because coincident lines share all their points. Memory cue: same line means infinitely many; parallel different lines mean none; intersecting lines mean one.

Related tags

Linear EquationsSame LineInfinite Solutions

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