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At which point do the lines 3x + 2y = 19 and x + 2y = 9 meet on the graph?

Answer and explanation

Correct answer: (5, 2)

The governing principle is that the point where two graphed lines meet must satisfy both equations. Subtract the second equation from the first: (3x + 2y) − (x + 2y) = 19 − 9. This gives 2x = 10, so x = 5. Substitute x = 5 into x + 2y = 9: 5 + 2y = 9, hence 2y = 4 and y = 2. The intersection is therefore (5, 2), making option A correct. Checking the point gives 3(5) + 2(2) = 19 and 5 + 2(2) = 9. Option B reverses the coordinates. Options C and D fail one or both original equations, so they cannot represent the common point on the graph.

Related tags

Graphical-IntersectionLinear-EquationsSimultaneous-EquationsGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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