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18.Cydney is proving that perpendicular lines have slopes that are opposite reciprocals. She draws line p and labels two points on the line as (0, a)(0, a) and (b, 0)(b, 0) .

Enter the answers, in simplest form, in the boxes to complete the proof.

The slope of line p is _____ . Rotate line p 90° counterclockwise about the origin to get line q. The labeled points on line p map

to (−a, 0)(−a, 0) and (___,___) on line q. The slope of line q is _____. The slopes of the lines are opposite reciprocals because

the product of the slopes is______ .

sii1lver Jan 7, 2018