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Class 10 Mathematics Pair of Linear Equations in Two Variables Graphical method of finding solutions.Expert

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If the lines (6x+ay=30) and (18x+12y=90) are coincident, what is the value of (a)?

Answer and explanation

Correct answer: (4)

The second equation is (3) times the first, so (3a=12) and (a=4). Include the constant term in ratio checking.

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Graphical Method Parameter Coincident Lines Ratio Test Graphical Method Of Finding Solutions.Graphical Method Of Finding Solutions Pair Of Linear Equations In Two Variables Mathematics

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