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What is the correct solution status for (x-y=2) and (2x-2y=5)?

Answer and explanation

Correct answer: No solution

Writing the equations in standard form gives \\(a_1=1,b_1=-1,c_1=-2\\) and \\(a_2=2,b_2=-2,c_2=-5\\). Thus, \\(a_1/a_2=1/2\\) and \\(b_1/b_2=(-1)/(-2)=1/2\\), but \\(c_1/c_2=(-2)/(-5)=2/5\\). Since \\(a_1/a_2=b_1/b_2\\) but \\(c_1/c_2\\) is different, the two lines are parallel and distinct, so they have no solution. Exam tip: for an inconsistent pair, the first two coefficient ratios are equal while the constant-term ratio is different.

Related tags

Linear EquationsNo SolutionSolvability ConditionsParallel LinesRatio TestConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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