The formula m= V2 - V1

X2 - X1

The product of these slopes is

This product

shows that the slopes are negative reciprocals. It is given

that the lines are perpendicular and we have shown that

the slopes of the lines are negative reciprocals.

Answer is (d-b/c-a)(c-a/-d+b)=1

in geometry, parallel lines are lines in a plane which do not meet; that is, two lines in a plane that do not intersect or touch each other at any point are said to be parallel. by extension, a line and a plane, or two planes, in three-dimensional euclidean space that do not share a point are said to be parallel.

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