when the slope is 0, the graph is a horizontal line on the x axis
so the y axis is perpendicular to it, which can be written x=0
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If you mean: y = 4x+5 then the perpendicular slope is -1/4
The slope is -0.2
Take the negative reciprocal of the lines slope you want it to be perpendicular to. For example y = 3x +2; perpendicular line slope is -1/3.
Perpendicular slope: -1/4 Perpendicular equation: y-0 = -1/4(x-3) => y = -0.25x+3
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