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What is p for no solution in px - 5y = 7 and 12x - 15y = 19?

Answer and explanation

Correct answer: p = 4

For no solution, the two equations must represent distinct parallel lines. In ratio form, this requires a₁/a₂ = b₁/b₂ but c₁/c₂ must be different. The y-coefficient ratio is (−5)/(−15) = 1/3. Therefore p/12 must equal 1/3, which gives p = 4. The constant ratio is 7/19, and 7/19 is not equal to 1/3. Thus the x- and y-coefficients are proportional, while the constants are not; the lines have equal slopes but different intercepts. They never intersect, so there is no solution. Hence option A is correct. The other listed values do not make p/12 equal to 1/3.

Related tags

Class10Linear-EquationsNo-SolutionParallel-LinesConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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