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How many solutions will the equations (7x+4y=19) and (14x+8y=41) have?

Answer and explanation

Correct answer: No solution

The coefficients of the first equation are proportional to the corresponding coefficients of the second equation: \\(\frac{7}{14}=\frac{4}{8}=\frac{1}{2}\\). However, the ratio of the constants is \\(\frac{19}{41}\\), which is not equal to \\(\frac{1}{2}\\). Thus, \\(\frac{a_1}{a_2}=\frac{b_1}{b_2}\ne\frac{c_1}{c_2}\\), so the two lines are distinct parallel lines and do not intersect. Hence, there is no solution. Exam tip: For infinitely many solutions, all three ratios must be equal.

Related tags

Pair Of Linear EquationsConditions For SolvabilityNo SolutionParallel LinesRatio CriterionPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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