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3 years ago

Solve using substitution. -5x + 10y = -10 y = -2

Mathematics

1 answer:

kykrilka [37]3 years ago

8 0

Answer:

Point Form:

( − 2 , − 2 )

Equation Form:

x = − 2 , y = − 2

Step-by-step explanation:

Solve for the first variable in one of the equations, then substitute the result into the other equation.

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Twice a number take away one

OlgaM077 [116]

2x -1 is the answer I believe

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3 years ago

Two people are standing on opposite sides of a hill. Person A makes an angle of elevation of 65° with the top of the hill and pe

8090 [49]

Answer:

Option 3. 71 ft. is the distance between B and top of the hill.

Step-by-step explanation:

Let the height of the hill is h ft and the distance of A from the hill be x ft and distance from B to hill is y.

It is given distance between A and B is 45 ft. ∠BAO = 65° and ∠ABO = 80°.

We have to find the distance of B from the top of the hill.

Now from ΔACO $tan 65 = \frac{h}{45-x} = 2.14$

$h=2.14(45-x)$

From ΔBCO $tan80 = \frac{h}{x} = 5.67$

h = 5.67x

Now h = 5.67x = 2.14(45-x)

5.67x = 96.3 - 2.14x

2.14x + 5.67x = 96.3

7.81x = 96.3

x = 96.3/7.81 = 12.33 ft

Therefore $cos80 = \frac{x}{OB}$

$0.174 = \frac{12.33}{OB}$

$OB = \frac{12.33}{.174}=70.86=71ft.$

Therefore 71 ft is the distance between B and the top of the hill.

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3 years ago

A store had a number of chairs in stock at the beginning of the week. During the week, 66 chairs were sold, leaving the store wi

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They had 81 chairs at the beginning

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Read 2 more answers

A homeroom was interested in surveying their students to find out opinions about the schools media center. To facilitate data co

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Answer: nonresponse bias

Step-by-step explanation:

According to the information obtained, we can say that it is a non-response bias, since the sample obtained to extrapolate the result was not homogeneous, so these biases arise when the type of response to the non-response is affected in a social experiment. meet a standard among the population muesta¡ra.

Cognitive biases are found in ideas that make us partial. These thoughts, along with certain external circumstances, create what are known as response biases.

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2 years ago

Which rule represents the transformation shown in the graph?

Oduvanchick [21]

D (x, y) ---> (x, -y)

We can look at Point X and Point X'.

Point X is at (2, -2), and Point X' is at (2, 2).

The y-value has been multiplied by -1, or turned positive, so the answer would be D.

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3 years ago