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For which set of lines is it reasonable to state that the two lines are almost perpendicular to each other?

Ay = 2.1x 3, y = 2.1x 5
By = 0.9x 5, y = -1.26x 8
Cy = 5x 1.25, y = -5x 1.25
Dy = 3/4x 0.28, y = 4/3x 0.29

Verified Answer :

apologiabiology

when you multiply their slopes and it gets to -1
y=mx+b

m=slope


A. 2.12.1=4.41
B. 0.9-1.26=-1.134
C. 5*-5=-25
D. 3/4 times 3/4=1


B is answer

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