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Mathematics 13 Online
OpenStudy (anonymous):

The slope of a line that is perpendicular to a line whose slope is -2/7 is

OpenStudy (mathstudent55):

The slopes of perpendicular lines are negative reciprocals.

OpenStudy (mathstudent55):

Negative reciprocals are two numbers whose product is -1.

OpenStudy (mathstudent55):

Given a number, to find its negative reciprocal do this: 1) if the number is not already written as a fraction, write it as a fraction (write the number over 1). 2) flip the fraction and change the sign.

OpenStudy (anonymous):

7/2?

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