All categories

3 years ago

What is 7x+5y=-12-7x−7y=14

Mathematics

2 answers:

posledela3 years ago

6 0

Answer: x = - 1

y = - 1

Step-by-step explanation:

The given system of equations is expressed as

7x + 5y = - 12- - - - - -- - - - - - - - - -1

- 7x - 7y = 14- - - - -- - - - - - - - - -2

Applying the elimination method, we would eliminate x by adding equation 1 to equation 2. It becomes

5y - 7y = - 12 + 14

- 2y = 2

Dividing the left hand side and the right hand side of the equation by

- 2, it becomes

- 2y/-2 = 2/-2

y = - 1

Substituting y = - 1 into equation 1, it becomes

7x + 5 × - 1 = - 12

7x - 5 = - 12

Adding 5 to the left hand side and the right hand side of the equation, it becomes

7x - 5 + 5 = - 12 + 5

7x = - 7

Dividing the left hand side and the right hand side of the equation by

7, it becomes

7x/7 = - 7/7

x = - 1

kramer3 years ago

3 0

Answer:

x=1/14 and y=1/12

Step-by-step explanation:

7x+5y+12+7x+7y=14

⇒14x+12y=2

and set x and y in 0

then you will have 14*(1/7)=2 and 12*(1*6)=2

and you want somthing that makes x + y =2

so you sett 14*x=1 and 12*y=1

that is if i did noy misunderstanding the question

You might be interested in

What are the values of x, y, and z?

adoni [48]

Answer:

x = 111

y = 36

z = 76

5 0

3 years ago

Isaac is making sandwiches for a group of friends. He needs 3 ounces of meat for each sandwich.

lidiya [134]

Answer:

Part A: x=3

Part B: 6oz

3x=18

Step-by-step explanation:

Part A-

So, he needs 3 oz for each sandwich.

This gives us 3 for the equation.

The question says that we need an equation for this.

If we need an equation, we could write something like

x=3

There's really not anything else that we could write here.

Part B-

We now have something that we need to write.

He has 18 oz for sandwiches.

Each sandwich needs 3 oz.

So, we can write something like 3x=18

Then we could solve the equation by dividing both sides by 3.

This will leave us with x=6

Hope this works!

6 0

3 years ago

Read 2 more answers

While she was on holiday,Olga measured the temperature at the same time every day. Here are the results. Work out the median: Th

alukav5142 [94]

Answer:

See Explanation

Step-by-step explanation:

The question is incomplete, as the required data are not given.

I will use the following data as an illustration of how to calculate median and range.

We have:

$x: 11, 13, 14, 15, 18, 20$

<u>Calculate range</u>

Identify the highest and the least

$Highest = 20$

$Least = 11$

So, the range is:

$Range = Highest -Least$

$Range =20-11$

$Range =9$

<u>Calculate the median</u>

The number of data we are using is 6 (i.e. even).

So, the position of the median item is:

$Median =\frac{1}{2}(n+1)$

$Median =\frac{1}{2}(6+1)$

$Median =\frac{1}{2}*7$

$Median =3.5th$

A decimal result implies that the median is the mean of the integer values before and after the result.

In this case, the median is the mean of the item at 3rd and 4th positions.

So:

$Median = \frac{14+15}{2}$

$Median = \frac{29}{2}$

$Median = 14.5$

3 0

3 years ago

It is -40°F on a cold night in the North Pole. When the sun is out the next day, it is -5°F. What is the difference in temperatu

Alexeev081 [22]

Answer:

-35°F

Step-by-step explanation:

-40 - -5 equals -35°F

8 0

3 years ago

In a class of 30 students, 13 of them are boys.

mote1985 [20]

Answer:

56.7%

Step-by-step explanation:

30-13=17

(on a scientific calculator) 17/30=

0.56666667 x 100= 56.7 (round it up)

you can use this method everytime when trying to find a percantge.

6 0

3 years ago