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Mathematics 21 Online
OpenStudy (anonymous):

Which pair of equations are perpendicular lines? A. 5x + 2y = 9 and y = –5/2x +27/2 B. x – 3y = 11 and y = –3x + 23 C. 4x + 2y = 6 and y = –2x + 18 D. x – 3y = 5 and y = 3x – 11

OpenStudy (lncognlto):

B, the gradient of a line x the gradient of a perpendicular line = -1.

OpenStudy (anonymous):

thanks :)

OpenStudy (lncognlto):

Cool cool :)

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