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Dominik [7]
2 years ago
5

The sum of a number and two is equal to negative seven. Translate this sentence to an equation and then find the number.

Mathematics
1 answer:
dimaraw [331]2 years ago
8 0

Answer: -9

Step-by-step explanation:

Given

The sum of a number and two is equal to negative 7

Suppose x is that number

\therefore x+2=-7\\\text{add -2 both sides}\\\Rightarrow x+2-2=-7-2\\\Rightarrow x=-9

So, the number is -9.

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A value that is not the solution to either inequality is 2. 2 is not greater than 2, and 2 is not less than 2.
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Nastasia [14]

Answer:

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Step-by-step explanation:

For quadrats the right top is 1

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2 years ago
Read 2 more answers
Find an equation of variation in which y varies inversely as x and y=5 and x=21. Then find the value of y when x=10.
finlep [7]

Answer:

see explanation

Step-by-step explanation:

Given that y varies inversely as x then the equation relating them is

y = \frac{k}{x} ← k is the constant of variation

To find k use the condition y = 5 , x = 21

k = yx = 5 × 21 = 105

y = \frac{105}{x} ← equation of variation

When x = 10, then

y = \frac{105}{10} = 10.5

7 0
3 years ago
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astraxan [27]

Answer:

(3, - 1)

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5x - 4y = -11

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Multiply the top equation by 2 and the bottom equation by - 5 to cancel out the x's.

10x - 8y = - 22

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Cancel out x's.

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Add like terms.

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Input y into one of the equations and solve for x.

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Simplify.

2x -3 = -9

Cancel out -3 by adding 3.

2x = -6

Divide.

x - -3

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