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jeka57 [31]
3 years ago
10

1-Determine a solução dos sistemas abaixo pelo método de adição: a) {x + y = 5 {2x- y=9 b) {3x - y = 10 {x + y =18 Prfvr gente

Mathematics
1 answer:
xeze [42]3 years ago
5 0

a)

X + Y = 5

<u>2X - Y = 9     </u>  

X + 2X + Y - Y = 5 + 9

3X = 14

<h3>X = 14/3</h3>

Para Y, basta substituir o valor de X em qualquer uma das 2 equacoes - arbitrariamente. Escolhendo a primeira:

X+ Y = 5

14/3 + Y = 5

Y = 5 - 14/3

<h3>Y = 1/3</h3>

.........................

b)

3X - Y = 10

<u>X + Y = 18       </u>  

3X + X - Y + Y = 10 + 18

4X = 28

<h3>X = 7</h3>

Para Y, basta substituir o valor de X em qualquer uma das 2 equacoes - arbitrariamente. Escolhendo a segunda:

X + Y = 18

7 + Y = 18

Y = 18 - 7

<h3>Y = 11</h3>
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skelet666 [1.2K]

The midpoint is

(-4+0) / 2, (7 + (-3))/ 2            The first one is x coordinate and 2nd is the y cood)

= (-2, 2)    answer

6 0
4 years ago
What number must i add to complete the square x^2+8x=-3
Sonja [21]

Answer:

16

Step-by-step explanation:

(b/2)^2

(8/2)^2 = (4)^2 = 16

(x^2+8x+16) = -3+16

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3 years ago
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Bad White [126]
1. 256
2. 7^7
3. 46,629
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7 0
4 years ago
Please answer and explain for brainlest!!​
satela [25.4K]

Answer:

B. 45

Step-by-step explanation:

To solve for angle A, we need to find the value of x. First, we need to find the interior angles of the triangle. We already know 2 of them, x+57 and 63+x but we need the third one. We can do that by subtracting 96 from 180 which is 84.

So now that we have the three interior angles of the triangle, we can make an equation. We already know that the sum of interior angles of a triangle is 180.

84+(x+57)+(63+x) = 180

Simplifying, we get:

204+2x=180

2x = -24

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Plugging x = -12 into x+57 gives 45 degrees. So, the answer is B.

6 0
3 years ago
Read 2 more answers
Choose all of the transformations that are rigid motions.
kkurt [141]

Answer:

The answer is below

Step-by-step explanation:

Transformation is the movement of a point from its initial location to a new location. Types of transformation are rotation, reflection, dilation and rotation.

Rigid transformations are transformation that produces an image with the same size, shape and angle as the original object. Rigid transformations are translation, rotation and reflection.

Dilation is not a rigid transformation.

All the transformations attached are rigid transformations.

7 0
3 years ago
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