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If (6x+2y=28) and (3x+y=14), what is the number of solutions?

Answer and explanation

Correct answer: Infinitely many solutions

The two equations represent the same straight line, so they do not give two separate conditions. When one equation is exactly a multiple of the other, every point satisfying one equation also satisfies the other. Therefore the pair does not select one particular ordered pair; it has infinitely many solutions. For example, the second equation can be written as y=14-3x, and every value of x gives a corresponding value of y.

To compare them, multiply 3x+y=14 by 2. This gives 6x+2y=28, which is exactly the first equation. Thus the equations are dependent and consistent, not contradictory. The correct choice is D, infinitely many solutions. Choice B would apply when the two lines meet at one point, while choice A would apply to distinct parallel lines.

Related tags

Linear EquationsDependent EquationsMediumClass 10

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