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What type of pair is formed by the equations (20x+28y=84) and (5x+7y=23)?

Answer and explanation

Correct answer: Inconsistent (parallel lines)

The ratios of the first two coefficients are equal: \(\frac{20}{5}=\frac{28}{7}=4\). However, the ratio of the constants, \(\frac{84}{23}\), is not equal to 4. Thus, \(\frac{a_1}{a_2}=\frac{b_1}{b_2}\ne\frac{c_1}{c_2}\), so the lines are parallel and have no common solution. Hence, the pair is inconsistent. Exam tip: Compare all three ratios to identify the consistency of a pair quickly.

Related tags

Pair Of Linear EquationsSolvability ConditionsInconsistent SystemParallel LinesClass 10 MathematicsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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