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What will be shown in the graph of the equations (30x+18y=126) and (5x+3y=21)?

Answer and explanation

Correct answer: Same line

Every coefficient in the first equation is 6 times the corresponding coefficient in the second: 30=6×5, 18=6×3, and 126=6×21. Dividing the first equation by 6 gives exactly 5x+3y=21. Hence, both equations represent the same line, and the pair has infinitely many solutions. Exam tip: if a₁/a₂ = b₁/b₂ = c₁/c₂, the two lines are coincident and the pair has infinitely many solutions.

Related tags

Linear EquationsConditions For SolvabilityGraphical RepresentationCoincident LinesInfinitely Many SolutionsPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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