Question

If A = (4,-5) and B = (7,-9), what is the length of AB?

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A. 7 units
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B. 6 units
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C. 8 units
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D. 5 units

Answer 1

D. 5 units

Explanation:

Answer 2

Opt D. 5

Explanation:

This is the distance between two points, which can be obtained with following equation.

`d=\sqrt{(x_(2)-x_(1))^2 +(y_(2)-y_(1))^2}`

Where (x2,y2)=(7,-9) and (x1,y1)=(4,-5)

Therefore, if we develop a little with the following:

(7-4)^2=(3)^2=9

(-9+5)^2=(-4)^2=16

Evaluating that in the equation, we have: sqrt(16+9)= sqrt(25)=5

That is the distance between those points.