3 years ago

What are the coordinates of r

Mathematics

2 answers:

Luba_88 [7]3 years ago

5 0

The coordinates of r is ( 4, -1 )

Ket [755]3 years ago

3 0

The coordinate of r is (4,-1)

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3 years ago

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Y_Kistochka [10]

Answer:

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Step-by-step explanation:

Given

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M=(-1,-1) ----- Missing part of question

Required

Determine the coordinates of D

Let the coordinates of D be (x₂,y₂)

We'll solve this question using mid point formula;

$M(x,y) = (\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})$

Where

$C(x_1,y_1) = (2,7)$ and $M(x,y) = (-1,-1)$

Put these values in the formula

$(-1,-1) = (\frac{2+x_2}{2},\frac{7+y_2}{2})$

By comparison;

$-1 = \frac{2+x_2}{2}$ and $-1 = \frac{7+y_2}{2}$

$-1 = \frac{2+x_2}{2}$

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Subtract 2 from both sides

$-2 -2 = x_2$

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3 years ago

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kakasveta [241]

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3 years ago