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Where do the lines 2x + 3y = 21 and x + 3y = 15 meet?

Answer and explanation

Correct answer: (6, 3)

The governing concept is that the common point of two lines is the simultaneous solution of their equations. Subtract the second equation from the first: (2x + 3y) − (x + 3y) = 21 − 15. The y-terms cancel, giving x = 6. Substitute x = 6 into x + 3y = 15: 6 + 3y = 15, so 3y = 9 and y = 3. Therefore the lines meet at (6, 3), making option B correct. Verification gives 2(6) + 3(3) = 21 and 6 + 3(3) = 15. Option A fails the first equation, option C reverses the coordinates, and option D gives 18 rather than 21 in the first equation. Thus only B satisfies both equations.

Related tags

Linear-EquationsIntersectionGraphical-MethodGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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