Help please, I really need help

Question

Use DE←→ and FG←→ to answer the question. DE←→ contains the points D(1,−2) and E(3,4). FG←→ contains the points F(−1,2) and G(4,0). Is DE←→ perpendicular to FG←→? Why or why not?

A) Yes, because the product of the slopes is 1.

B) No, because the product of the slopes is not −1.

C) No, because the product of the slopes is not 1.

D) Yes, because the product of the slopes is −1.

Answer 1

Slopes have to be negative reciprocal.

Do you know how to calculate slope? Y₂-Y₁ / X₂-X₁

Answer 2

B) No, because the product of the slopes is not −1