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What are the coordinates of point E, which partitions the directed line segment from A to B into a ratio of 1:2?

Given the formula:
[tex]\[
\begin{array}{l}
x = \left(\frac{m}{m+n}\right) (x_2 - x_1) + x_1 \\
y = \left(\frac{m}{m+n}\right) (y_2 - y_1) + y_1
\end{array}
\][/tex]

Choose the correct coordinates:

A. (0,1)
B. (-1,3)
C. (-2,5)
D. (1,0)


Sagot :

To find the coordinates of point [tex]\(E\)[/tex] which partitions the directed line segment from [tex]\(A\)[/tex] to [tex]\(B\)[/tex] into a ratio of [tex]\(1:2\)[/tex], we can use the section formula. The coordinates of point [tex]\(A\)[/tex] are [tex]\((0, 1)\)[/tex] and the coordinates of point [tex]\(B\)[/tex] are [tex]\((1, 0)\)[/tex]. The ratio [tex]\(m:n\)[/tex] is [tex]\(1:2\)[/tex].

The formula to find the coordinates of the point that divides the line segment in the ratio [tex]\(m:n\)[/tex] is:

[tex]\[ x = \left(\frac{m}{m+n}\right)(x_2 - x_1) + x_1 \][/tex]

[tex]\[ y = \left(\frac{m}{m+n}\right)(y_2 - y_1) + y_1 \][/tex]

Let's apply this step by step:

1. Identify the given coordinates and the ratio:

[tex]\(x_1 = 0\)[/tex], [tex]\(y_1 = 1\)[/tex]

[tex]\(x_2 = 1\)[/tex], [tex]\(y_2 = 0\)[/tex]

[tex]\(m = 1\)[/tex], [tex]\(n = 2\)[/tex]

2. Calculate the [tex]\(x\)[/tex]-coordinate:

[tex]\[ x = \left(\frac{m}{m+n}\right)(x_2 - x_1) + x_1 \][/tex]

[tex]\[ x = \left(\frac{1}{1+2}\right)(1 - 0) + 0 \][/tex]

[tex]\[ x = \left(\frac{1}{3}\right)(1) + 0 \][/tex]

[tex]\[ x = \frac{1}{3} \][/tex]

3. Calculate the [tex]\(y\)[/tex]-coordinate:

[tex]\[ y = \left(\frac{m}{m+n}\right)(y_2 - y_1) + y_1 \][/tex]

[tex]\[ y = \left(\frac{1}{1+2}\right)(0 - 1) + 1 \][/tex]

[tex]\[ y = \left(\frac{1}{3}\right)(-1) + 1 \][/tex]

[tex]\[ y = -\frac{1}{3} + 1 \][/tex]

[tex]\[ y = 1 - \frac{1}{3} \][/tex]

[tex]\[ y = \frac{3}{3} - \frac{1}{3} \][/tex]

[tex]\[ y = \frac{2}{3} \][/tex]

Therefore, the coordinates of point [tex]\(E\)[/tex] that partitions the line segment from [tex]\(A\)[/tex] to [tex]\(B\)[/tex] in the ratio [tex]\(1:2\)[/tex] are:

[tex]\[ (x, y) = \left( \frac{1}{3}, \frac{2}{3} \right) \][/tex]

In decimal form, these coordinates are approximately:
[tex]\[ (x, y) \approx (0.3333333333333333, 0.6666666666666667) \][/tex]

Thus, the [tex]\(x\)[/tex]-coordinate of point [tex]\(E\)[/tex] is [tex]\(0.3333333333333333\)[/tex] and the [tex]\(y\)[/tex]-coordinate is [tex]\(0.6666666666666667\)[/tex].