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jasenka [17]
3 years ago
8

B is the midpoint of AC. Find the value of x and the length of AB given

Mathematics
1 answer:
ad-work [718]3 years ago
8 0

Answer:

11

Step-by-step explanation:

AB  and BC are equal. I mid point divides a segment into 2 equal pieces.

5x - 9 = 3x - 1                       Subtract 3x from both sides

5x - 3x - 9 = 3x - 3x - 1         Combine

2x - 9 = - 1                            Add  9 to both sides

2x - 9 + 9 = - 1 + 9                Combine

2x = 8                                   Divide by 2

2x/2 = 8/2

x = 4

AB length

5x - 9 = 5*4 - 9 = 20 - 9 = 11

AB = 11

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oksian1 [2.3K]

Answer:

La ordenada de Q es 7.

Step-by-step explanation:

La ecuación de una recta es:

y = a*x + b

donde a es la pendiente y b es la ordenada al origen.

Para este problema, sabemos que la pendiente es -2

Entonces:

a = -2

y = -2*x + b

También sabemos que esta recta pasa por el punto (5, -1)

Esto significa que cuando evaluamos la ecuación en x = 5, y toma el valor y = -1

Si reemplazamos esos valores en la ecuación, obtenemos:

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Entonces la ecuación de la recta es:

y = -2*x + 9

Sabemos que el punto Q está en la línea, y la abscisa de este punto es 1.

Entonces este punto es Q (1, k)

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Porque nuestra línea también pasa por este punto, podemos concluir que cuando x = 1, y = k

Reemplazando eso en la ecuación tenemos:

k = -2*1 + 9 = -2 + 9 = 7

k = 7

La ordenada de Q es 7.

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