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If 4x + 3y = p and 8x + 6y = 42 give infinitely many solutions, what is p?

Answer and explanation

Correct answer: 21

The governing concept is the condition for infinitely many solutions. The two equations must represent the same line, so every coefficient and constant in the second equation must be the same multiple of the corresponding quantity in the first. Since 8x is twice 4x and 6y is twice 3y, the second equation must equal 2 times the first equation. Multiplying 4x + 3y = p by 2 gives 8x + 6y = 2p. Comparing this with 8x + 6y = 42 yields 2p = 42, so p = 21. Therefore option C is correct. If p had any other value, the lines would have equal variable coefficients but different constants, making them distinct parallel lines with no solution.

Related tags

Infinitely Many SolutionsCoincident LinesParameterConsistency ConditionConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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