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For (5x+10y=20) and (kx+2y=7) to have no solution, what is the value of (k)?

Answer and explanation

Correct answer: \(k=1\)

Dividing the first equation by 5 gives \(x+2y=4\). On putting \(k=1\), the second equation becomes \(x+2y=7\). The coefficients of \(x\) and \(y\) are the same, but the constants are different; hence the lines are parallel and have no solution. For \(k=2\) or \(k=5\), the coefficient ratios are not equal, so the lines intersect at one point. Exam tip: for no solution, check \(a_1/a_2=b_1/b_2\ne c_1/c_2\).

Related tags

Pair Of Linear EquationsNo SolutionConsistent EquationsParameterElimination MethodClass 10 MathematicsConditions For SolvabilityPair Of Linear Equations In Two Variables

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