Slopes of Parallel and Perpendicular lines

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Line e has a slope of -9/7. Line f has a slope of 9/4. Are line e and f parallel, perpendicular, or neither?

neither

Line q has a slope of -6/7. Line r is parallel to line q. What is the slope of line r?

-6/7

Line c has a slope of -9/4. Line d is perpendicular to c. What is the slope of line d?

4/9

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