2. Are the following lines parallel, perpendicular or neither: y=-2x and 2y-8 = x
The line y = -2x has the slope -2 while the line 2y - 8 = x or y = (x + 8)/2 has the slope 1/2 (the coefficient at x). Since the product of the slopes is (-2) (1/2) = -1, the lines are perpendicular.
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