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If y = 3 and 2x − 5y = 1 are graphed, what is their intersection point?

Answer and explanation

Correct answer: (8, 3)

The governing idea is that the intersection point satisfies both equations simultaneously. Since the first line is y = 3, the y-coordinate of the intersection must be 3. Substitute this value into the second equation: 2x − 5(3) = 1, so 2x − 15 = 1, hence 2x = 16 and x = 8. Therefore the intersection is (8, 3), which is option A. Option B reverses the coordinates. Option C keeps y = 3 but does not satisfy the second equation, since 2(5) − 15 = −5. Options D has the coordinates in an unsuitable order and also fails the fixed y = 3 condition. The horizontal line y = 3 makes the coordinate check especially direct.

Related tags

Graphical MethodIntersectionHorizontal LineLinear EquationsGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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