Andy C. answered • 09/10/18

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Perpendicular lines have slopes that are negative reciprocals.

The given line has slope M=2.

So the perpendicular line has slope (-1/2)

B = y - mx = 2 - (-1/2)(-1) = 2 - (1/2) = 3/2

y = (-1/2)x + 3/2