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At which point will the lines 3x + 2y = 18 and x − y = 1 meet on the graph?

Answer and explanation

Correct answer: (4, 3)

The governing concept is that the intersection of two non-parallel lines is the ordered pair satisfying both equations simultaneously. From x − y = 1, rearrange to obtain y = x − 1. Substituting this into 3x + 2y = 18 gives 3x + 2(x − 1) = 18, so 3x + 2x − 2 = 18, 5x = 20, and x = 4. Then y = 4 − 1 = 3. Hence the lines meet at (4, 3), so option A is correct. Verification gives 3(4) + 2(3) = 12 + 6 = 18 and 4 − 3 = 1. The other listed points fail one or both equations, so they cannot represent the common intersection.

Related tags

Intersection-Of-LinesSimultaneous-EquationsSubstitutionGraphical-SolutionGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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