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Alexus [3.1K]
3 years ago
5

Solve the system of equations below. A. B. C. D.

Mathematics
1 answer:
timofeeve [1]3 years ago
7 0

Answer:

  A.  (-7 -2)

Step-by-step explanation:

You can eliminate y by multiplying the first equation by 7 and subtracting 6 times the second equation:

  7(-3x +6y) -6(5x +7y) = 7(9) -6(-49)

  -21x +42y -30x -42y = 63 +294 . . . . eliminate parentheses

  -51x = 357 . . . . . . . . collect terms

  x = -7 . . . . . . . divide by -51. This matches answer choice A.

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21) Which expression is equivalent to 6(7x − 4)? A) 13x − 10 B) 13x − 24 C) 42x − 10 D) 42x − 24
Sergio039 [100]

Answer:

Answer is D) 42x − 24

Step-by-step explanation:

Opening the expression given in question

6(7x − 4)

6 will be multiplied by both items present inside parenthesis.

it can be written as

={(6 * 7x) - (6*4)}

=42x-24

Hope that clears the question.

7 0
3 years ago
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nata0808 [166]

Answer:

V = 115.5 cubic yards

Step-by-step explanation:

V (cone) = 1/3πr²h

just substitute given values to get:

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V = 115.5 cubic yards

3 0
2 years ago
What is the value of n?
algol [13]

Answer:

14

Step-by-step explanation:

5 0
3 years ago
The relationship between gallons and liters and a currency exchange rate between United States dollars and Canadian dollars are
ludmilkaskok [199]

The cost of the gasoline in US dollars is  $53.24.

<h3 /><h3>Definition of exchange rate</h3>

Exchange rate is the rate at which one currency is exchanged for another currency. In this question, $1 would be exchanged for 1.26 Canadian dollars.

<h3>Conversion of 15 gallons to liters</h3>

In order to convert 15 gallons to liters, multiply 15 by 3.79

15 x 3.79 = 56.85 liters

<h3>Total cost of of 56.85 liters in Canadian dollars </h3>

56.85 liters x C$1.18 = C$67.083

<h3>Total cost in US dollars</h3>

C$67.083 / 1.26 = $53.24

To learn more about exchange rate, please check: brainly.com/question/25780725

4 0
3 years ago
(9p-5q)^2=can anyone plss answers this ​
DIA [1.3K]

Step-by-step explanation:

{(9p - 5q)}^{2}

Hence according to ,

{(a - b)}^{2}  =  {a}^{2}   -  2ab +  {b}^{2}

So,

{(9p)}^{2}  - 2 \times 9p \times 5q +  {(5q)}^{2}

81 {p}^{2}  - 90pq + 25 {q}^{2} (ans)

8 0
3 years ago
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