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3 years ago

Solve the following system of equations: -2x+y=1

Mathematics

1 answer:

castortr0y [4]3 years ago

7 0

You can subtract the second equation from the first:
.. (-2x +y) -(-4x +y) = (1) -(-1)
.. 2x = 2 . . . . . . . . . . . . . . . . . . . simplify
.. x = 1 . . . . . . . . . . . . . . . . . . . . . divide by 2

This corresponds to selection D) (1, 3).

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<img src="https://tex.z-dn.net/?f=7%20%5Cfrac%7B2%7D%7B3%7D%20%20" id="TexFormula1" title="7 \frac{2}{3} " alt="7 \frac{2}{3}

sammy [17]

Answer:

$7 \frac{2}{3}=\frac{7*3+2}{3}=\frac{23}{3}$

$7 \: \frac{1}{2}=\frac{7*2+1}{2}=\frac{15}{2}$

$5842 \div 23=254$

8 0

3 years ago

The number 21 is what percent of 75

lesantik [10]

Answer:

28 percent

Step-by-step explanation:

To find what percentage of a number another number is, you can basically just divide it, 21/75 then you can multiply it by 100, so 21/75=0.28, and then 0.28*100=28, 21 is 28 percent of 75

5 0

3 years ago

Eduardo’s average speed on his commute to work was 55 miles per hour. On the way home, he hit traffic and only averaged 40 miles

Angelina_Jolie [31]

40(1.25-t) is missing from the table

Time, speed, and distance are the three factors must be taken into account.

How to solve such time related questions?

The key concept for solving such questions is the relationship between speed, distance and time.

The relationship between them is Distance = Speed X Time

We provide both time and speed.

It is necessary to compute the distance.

55 miles per hour is the commuter speed

Worktime equals 1.25-T

Home-bound speed is 40 miles per hour.

1.25 seconds to get home

Time in Total = T + t = 1.25

Travel distance to home

Distance/Time x Speed

40 = Total Distance/t

Distance overall = 40 (1.25-t)

As a result, 40(1.25-t) is the right response.

Learn more about time related questions :

brainly.com/question/12876231

#SPJ4

6 0

2 years ago

On the basis of data from 1990 to 2006, the median income y in the year x for men and women is approximated by the equations giv

worty [1.4K]

Answer:

2080

Step-by-step explanation:

The solution to these equations might best be found using Cramer's Rule. It tells you ...

x = (56939×3 -41655×2)/(-236×3 +838×2) = 87507/968 ≈ 90.400

This is years after 1990, so the year the incomes become the same is predicted to be ...

1990 +90.4 = 2080.4

The median incomes will be the same in the year 2080.

7 0

4 years ago

99/100 * 0.4......<br> please solve this ASAP

nekit [7.7K]

Answer is 0.396
To make it easier, I converted the fraction to a decimal (0.99), then multiplied 0.99 • 0.4 which will equal 0.396 or 99/250.

5 0

4 years ago