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zubka84 [21]
3 years ago
9

What ordered pair is a solution to y = x + 5 and x - 5y = -9? I also need to show the work.

Mathematics
1 answer:
Margarita [4]3 years ago
3 0

Answer:

(- 4, 1 )

Step-by-step explanation:

Given the 2 equations

y = x + 5 → (1)

x - 5y = - 9 → (2)

Substitute y = x + 5 into (2)

x - 5(x + 5) = - 9 ← distribute and simplify left side

x - 5x - 25 = - 9

- 4x - 25 = - 9 ( add 25 to both sides )

- 4x = 16 ( divide both sides by - 4 )

x = - 4

Substitute x = - 4 into either of the 2 equations and evaluate for y

Substituting into (1)

y = - 4 + 5 = 1

Solution is (- 4, 1 )

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Answer:

D. 2 1/4.

Step-by-step explanation:

First, convert both -5 1/4 and -7 1/2 into improper fraction. These would be -21/4 and -15/2.

-21/4 - (-15/2)

Two negatives in a row make a positive.

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Double both the numerator and denominator of 15/2 to make it have the same denominator as -21/4. This would 30/4.

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Put -21 + 30 over 4 to make it a single fraction.

(-21 + 30)/4

Add -21 and 30 to get 9.

9/4

Convert 9/4 into a mixed number: 2 1/4

The answer to -5 1/4 - (-7 1/2) is 2 1/4, which is D.

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4 0
2 years ago
Find ratio of 378 to 945
Bingel [31]

Answer:

2:5

Step-by-step explanation:

We can simplify the ratio 378 : 945 by dividing both terms by the greatest common factor (GCF).

The GCF of 378 and 945 is 189.

Divide both terms by 189.

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Therefore:

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5 0
3 years ago
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Naya [18.7K]

Answer:

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Step-by-step explanation:

Let's use a ratio:

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(√x)-3 = 2-3


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4 years ago
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