For two items (Planes, lines, line segments, ect.) to be perpendicular that means that they meet at a 90 degree angle. Perpendicularity is denoted by the ⊥ symbol. For example line AB ⊥ line CD would mean that the line AB would be perpendicular to the line CD.
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two lines that intersect at 90 degrees are perpendicular ex +
Graphs in math books
It has no right angles, so if that is what you mean, no, it is not.
If you mean: y = 4x+2 then the line perpendicular to it will have a slope of -1/4
If you mean: 2x-3y = 8 then y = 2/3x-8/3 and the perpendicular slope is -3/2