In the xy-plane, the point (1,2) is on line j, and the point (2,1

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In the xy-plane, the point (1,2) is on line j, and the point (2,1) is on line k. Each of the lines has a positive slope.

Quantity A:The slope of line j

Quantity B:The slope of line k

A、Quantity A is greater.
B、Quantity B is greater.
C、The two quantities are equal.
D、The relationship cannot be determined from the information given.

答案：D

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