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likoan [24]
4 years ago
15

Will mark best answer.. The equations in this sytem were added to solve for x. What is the value of x? -2x+y=8 5x-y=-5 3x=3

Mathematics
1 answer:
Juli2301 [7.4K]4 years ago
5 0

The value of x=1

Step-by-step explanation:

Given the equations as :

-2x + y= 8

 5x  - y= -5  ------adding the equations

---------------------

  3x     =   3  -------dividing both sides by 3

  x       =    1

Learn More

Simultaneous equations : brainly.com/question/12318095

Keywords : equations, system, value

#LearnwithBrainly

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You travel 300 km in a Sierra GMC 4WD truck. Gas costs $1.01/L. The gas mileage
rusak2 [61]

Part A)

The mileage for city use is 16.81 L per 100 km. In other words, if you traveled 100 km in the city, then you use up 16.81 liters of gas.

We can set up this equation

16.81 liters = 100 km

Multiply both sides by 3 so that the "100 km" turns into "300 km"

16.81 liters = 100 km

3*16.81 liters = 3*100 km

50.43 liters = 300 km

<h3>Answer: 50.43 liters</h3>

==================================

Part B)

Multiply the answer in part A by the cost per liter, which is $1.01

Total cost = (cost per liter)*(number of liters)

Total cost = (1.01)*(50.43)

Total cost = 50.9343

Total cost = 50.93

<h3>Answer: 50.93 dollars</h3>

==================================

Part C)

We're effectively repeating part A, but now we're using the highway mileage value.

11.8 liters = 100 km

3*11.8 liters = 3*100 km

35.4 liters = 300 km

<h3>Answer: 35.4 liters</h3>

==================================

Part D)

We follow similar steps as we did in part B. Use the value in part C to get

Total cost = (cost per liter)*(number of liters)

Total cost = (1.01)*(35.4)

Total cost = 35.754

Total cost = 35.75

<h3>Answer: 35.75 dollars</h3>

==================================

Part E)

Subtract the results of parts B and D

50.93 - 35.75 = 15.18

<h3>Answer: 15.18 dollars</h3>
4 0
3 years ago
Really need help?<br> the right answer gets crown
elena55 [62]

Answer:

SOS SOMEONE

Step-by-step explanation:

4 0
3 years ago
What is the x?<br><br> 4x+2=2(x+6)
Oksi-84 [34.3K]

Answer:

x = 5

Step-by-step explanation:

4x + 2 = 2(x + 6) \\ 4x + 2 = 2x + 12 \\ 4x - 2x =  - 2 + 12 \\ 2x = 10 \\  \frac{2x}{2}  =  \frac{10}{2}  \\ x = 5

6 0
3 years ago
Read 2 more answers
WILL MAKE BRAINLIEST
podryga [215]

Answer: See below for table

<h3>Explanation:</h3>

What we know:

  • Mary is 1st
  • Isabella is a few seconds behind Mary
  • Pilar is two places behind Isabella
  • Anna is ahead of Pilar

How to solve:

Using Mary as a starting point, we can make accurate guesses to each person's rank.

<h3>Process:</h3>

Mary

1st place, known constant

Isabella

2nd place, just behind Mary

Pilar

4th place, 2 places behind Isabella

Anna

3rd place, ahead of Pilar and behind Isabella

<h3>Solution:</h3>

___________

Place | Name

 1st   |  Mary

2nd  |  Isabella

 3rd  |  Anna

4th    |  Pilar

---------------------

4 0
3 years ago
Read 2 more answers
X + 2y = 3
LekaFEV [45]

Answer:

Step-by-step explanation:

x+2y=3

3x-2y=5

eliminate y

4x=8

x=2

Substitute 4 x in equation 1

2+2y=3

y=1/2

5 0
4 years ago
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