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If 5x + 4y = p and 15x + 12y = 96 give infinitely many solutions, what is p?

Answer and explanation

Correct answer: 32

The governing concept is the condition for infinitely many solutions of a pair of linear equations. Infinitely many solutions occur when both equations represent the same, or coincident, line. The coefficients of x and y in the second equation satisfy 15 = 3 × 5 and 12 = 3 × 4. Therefore, for the constant terms to have the same proportionality, 96 must also equal 3p. Solving 3p = 96 gives p = 96/3 = 32. Hence option C is correct. If p were 30, 31, or 33, the constant-term ratio would not equal the coefficient ratio, so the two equations would represent distinct parallel lines rather than one common line. Thus the algebraic ratio test and the graphical interpretation agree.

Related tags

Conditions For SolvabilityInfinite SolutionsCoincident LinesPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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