Is y=2x perpendicular to y= -0.5x ? Or only when the scales are equal aspect?

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Is y=2x perpendicular to y= -0.5x ? Or only when the scales are equal aspect?

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Also, two lines in the plane are perpendicular if the slope of one of them is zero and the slope of the other is undefined.Two lines in the plane are perpendicular when the product of their slopes is -1. In order for them to look perpendicular when graphed, yes, the two axes must be equally scaled.