Mathematics : asked on gwendallinesikes

19.03.2023

which equation results from adding the equations i this system?
-2x+y=8
5x-y=-5

4

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Chemistry

Which equation results from adding the equations in this system? -2x+y=8 5x-y=-5

Step-by-step answer

P Answered by PhD

20

3 x = 3.

Value of x = 1 and y = 10.

Explanation:

Adding the two equations:

-2x + y = 8

5x - y = -5

Will give:

5x + (-2x) + y + (-y) = 8 + (-5)

∴ 3 x = 3.

∴ x = 1.

Substituting in any equation to get y:

-2(1) + y = 8.

∴ y = 10.

Mathematics

Can you me, which equation results from adding the equations in this system? -2x+y=8 5x-y=-5 a)7x=13 b)7x=3 c)3x=3 d)3x=13

Step-by-step answer

P Answered by Specialist

26

It’s D it’s substitution just not simplified

Chemistry

Which equation results from adding the equations in this system? -2x+y=8 5x-y=-5

Step-by-step answer

P Answered by PhD

20

3 x = 3.

Value of x = 1 and y = 10.

Explanation:

Adding the two equations:

-2x + y = 8

5x - y = -5

Will give:

5x + (-2x) + y + (-y) = 8 + (-5)

∴ 3 x = 3.

∴ x = 1.

Substituting in any equation to get y:

-2(1) + y = 8.

∴ y = 10.

Mathematics

Deanna gets 3 problems incorrect on a math quiz. Her score is 85%. How many questions are on the quiz?

Step-by-step answer

P Answered by PhD

The answer is in the image

The answer is in the image

Mathematics

Anthony received $150 for his birthday this year. This was $10 less than half the amount he received last year. How much money did Anthony receive for his birthday last year?

Step-by-step answer

P Answered by PhD

The answer is in the image

The answer is in the image

Mathematics

An online media service offers video and music downloads. Each download of a song costs $1. Each download of a video costs 5 times as much as the song download. You have a credit of $70. How many songs can you purchase after buying 12 videos?

Step-by-step answer

P Answered by PhD

The answer is in the image

The answer is in the image

Mathematics

In a parking lot, for every 8 cars there are 7 trucks. What is the ratio of cars to trucks? A)7 : 8 B)8 : 7 C)8 : 15 D)15 : 8

Step-by-step answer

P Answered by PhD

For every 8 cars there are 7 trucks

Therefore,

Cars:Truck=8:7

Answer is B)8:7

Mathematics

The value of a collectible coin can be represented by the equation y = 2 x + 15, where x represents its age in years and y represents its total value in dollars. What is the value of the coin after 19 years? $2 $23 $38 $53

Step-by-step answer

P Answered by PhD

y=2x+15

where y=Value of coin

x=Age in years

Value of coin after 19 years=2*19+15

=$53

Therefore, Value after 19 years=$53

Mathematics

Use the X method to find the solutions of6x2 + 2x – 20 = 0.

Step-by-step answer

P Answered by PhD

The answer is in the image

The answer is in the image

Mathematics

A 4300-N force from a car s engines produces an acceleration of 3.3 m/s2. What is the mass of the car? A. 4300 kg B. 1300 kg C. 14,000 kg D. 390 kg

Step-by-step answer

P Answered by PhD

F=ma

where F=force

m=mass

a=acceleration

Here,

F=4300

a=3.3m/s2

m=F/a

=4300/3.3

=1303.03kg

Approximately it is aqual to 1300kg

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