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Question

wat are orthogonal pairs

Answer 1

orthogonal pairs of what????
of lines:
y= mx + b, and y= nx + c are orthogonal lines if n= -1/m.
of vectors:
(x1,x2) and (y1,y2) are orthogonal if x1x2 + y1y2 =0 .

Answer 2

Orthogonal vectors are ordered pairs:

(x₁, y₁) and (x₂, y₂)

That have the property:

x₁x₂ + y₁y₂ = 0

Or, equivalently,

x₁x₂ = -y₁y₂