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For prices of two items, the equations (10x+3y=470) and (20x+6y=955) are formed. What type of system is this?

Answer and explanation

Correct answer: Parallel lines with no solution

Here, \(a_1/a_2=10/20=1/2\) and \(b_1/b_2=3/6=1/2\), but \(c_1/c_2=470/955\neq1/2\). Thus, the two lines have the same slope but different intercepts, so they are parallel and have no point of intersection. Therefore, the system is inconsistent. A common mistake is to conclude that equal first two ratios imply infinitely many solutions; the third ratio must also be equal for coincident lines. Exam tip: if \(a_1/a_2=b_1/b_2\neq c_1/c_2\), the system is inconsistent.

Related tags

Pair Of Linear EquationsConditions For SolvabilityInconsistent SystemParallel LinesClass 10Pair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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