In a graph, you first must find the slopes of both lines using the rise over run method or by using the x2-x1 over y2-y1 method known as slope formula. The lines will be perpendicular if the slope of one line is opposite reciprocal of the other. the opposite reciprocal of 1/2 is -2
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The sides on a ladder are perpindicular from each other.
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That the slopes of the lines are the opposite of each other and negative. Ex: y=2/3x+b then the line perpendicular to it is y=-3/2+b
If the slope of the equations are the same then they are parallel If the slope of the equations are minus reciprocal then they are perpendicular If the slope of the equations are different then they are neither
Obviously it can.The type of lines that are perpendicular but do not intersect are known as 'Skew' lines. These can be better understood by using vectors in three-dimensional.I have reason to think that you yourself, do not know what your asking for and therefore I must tell you this. 90degrees= perpendicular.