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At which point will the lines (x=4) and (y=9) meet?

Answer and explanation

Correct answer: ( (4,9) )

The equation x=4 describes a vertical line. Every point on it has horizontal coordinate 4, while its vertical coordinate can be any real number. Similarly, y=9 describes a horizontal line. Every point on it has vertical coordinate 9, while its horizontal coordinate can be any real number.

Their common point must satisfy both conditions simultaneously: its x-coordinate must be 4 and its y-coordinate must be 9. Therefore the intersection is (4,9), so option B is correct. The order matters in an ordered pair: (9,4) would have x=9 and y=4, so it does not satisfy either required combination. Points (4,0) and (0,9) lie on only one of the two lines.

Related tags

Vertical Horizontal LinesIntersectionSolution

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