# geometry

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?

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

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1. Is it D?

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2. I tried A but it was wrong . Both the slopes are different not the same

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3. So, you guessed twice. That's not the same as solving the problem.
DE has slope (4+2)/(3-1) = 4
FG has slope (0-2)/(4+1) = -2/5
since 4 * -2/5 ≠ the lines are not perpendicular ... (B)

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4. slope of ED = (4+2)/(3-1) = 3
slope of FG = (0-2)/(4+1) = -2/5

For 2 lines to be perpendicular the product of their slopes must be -1

So what is your conclusion ?

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Reiny
5. its b

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