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What is the solution status of 4x-7y=5 and 12x-21y=17?

Answer and explanation

Correct answer: No solution

The governing concept is the consistency condition for a pair of linear equations in two variables. Write the equations in the form a₁x+b₁y+c₁=0 or compare the corresponding coefficients directly. For the x-coefficients, 4/12=1/3, and for the y-coefficients, (-7)/(-21)=1/3. Thus the two left-hand sides are proportional. However, the constants have ratio 5/17, which is not equal to 1/3. Therefore the two equations represent distinct parallel lines, so they do not intersect and have no common solution. Hence option C is correct. Infinitely many solutions would require the constant ratio to match as well; a unique solution would require unequal coefficient ratios.

Related tags

Class10Linear-EquationsConsistency-ConditionConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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