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Alecsey [184]
3 years ago
14

Line segment AB has endpoints A(10, 4) and B(2, 8). Find the coordinates of the point that divides the line segment directed fro

m A to B in the ratio of 1:4.
A) (6, 6)
B) (2, 56/5)
C) (24/5, 42/5)
D) (42/5, 24/5)
Mathematics
1 answer:
Bess [88]3 years ago
6 0

So despite what you may think, <u>1:4 is not 1/4 in this situation,</u> but rather it's "1 equal part to 4 equal parts", which is a total of 5 equal parts. <u>In short, they are asking you for the point at the 1/5 mark from A to B.</u>

Firstly, how many units apart is 10 to 2 (the x-coordinates)? That would be 8 units. Multiply 1/5 by 8:

\frac{1}{5}\times \frac{8}{1}=\frac{8}{5}

Next, how many units apart is 4 to 8 (the y-coordinates)? That would be 4 units. Multiply 1/5 by 4:

\frac{1}{5}\times \frac{4}{1}=\frac{4}{5}

Now, since from 10 to 2 you are <u>decreasing</u>, subtract 8/5 from 10:

\frac{10}{1}\times \frac{5}{5}=\frac{50}{5}\\\\\frac{50}{5}-\frac{8}{5}=\frac{42}{5}

42/5 is the x-coordinate.

Now, since from 4 to 8 you are <u>increasing</u>, add 4/5 to 4:

4+\frac{4}{5}=4\frac{4}{5}=\frac{24}{5}

24/5 is the y-coordinate.

<u>Putting it together, the point is (42/5, 24/5), or D.</u>

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