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If 3x + 2y = p and 6x + 4y = 20 give infinitely many solutions, what is p?

Answer and explanation

Correct answer: 10

The governing condition for infinitely many solutions is that the two linear equations represent the same, coincident line. The left side of the second equation is exactly twice the left side of the first: 2(3x + 2y) = 6x + 4y. Therefore its constant term must also be twice the first constant: 2p = 20. Dividing by 2 gives p = 10, so option B is correct. If p were 5, the first equation multiplied by 2 would have constant 10, not 20. If p were 15 or 20, the coefficient ratios would no longer match the constant ratio, producing parallel distinct lines or a unique intersection rather than infinitely many solutions. Thus equality of all corresponding ratios is essential.

Related tags

Linear EquationsInfinite SolutionsCoincident LinesGraphical MethodGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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