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pre-algebra help

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Determine which two equations represent perpendicular lines.
(a) y = 3/10x -3
(b) y= - 10/3x -3
(c) y = -1/5x + 3/10
(d) y = 1/5x – 3/10

Equations (a) and (b) are perpendicular t one another, because the product of the slopes is -1.

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