Mathematics Middle School

Solve the system using addition. Use pencil and paper. Explain why the addition method is a good choice for solving the system. If you wanted to solve for x​ first, is the addition method still a good​ choice? Explain.

x-2.5y=12.5
-x+2.3y=11.9

Answers

Answer 1

Answer: the answers are x = -292.5 and y = -122

Step-by-step explanation:

Elimination is combining equations to obtain an equation with just one variable. This is only possible if the coefficients of one variable in both equations are opposed and will cancel each other out when put together. Elimination is most effective when it occurs naturally in the equations, but equations may also be modified to produce typical coefficients by multiplying or dividing equations by a given value. The next step would be to utilize the equation we devised to determine the variable's worth and then insert that value back into the original equation to determine the remaining variable.

For solving the question to find x we have to make the coefficients of y the same. for that, we will multiply the first equation by 2.3 and the second equation by 2.5.

After that, we get the 2 equations as

2.3x-5.75y = 28.75

-2.5x+5.75y = 29.75

then by adding the 2 equations we get

-0.2x = 58.5

and by dividing 58.5 by -0.2 we get

x = -292.5

substituting the value of x in any equations above we get

y = -122

Related Questions

If someone said on your order please sub anything gluten free for toast what would you think?

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Answer:

yep

Step-by-step explanation:

What's the value of p? 1/2p=36

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Answer:

72

Step-by-step explanation:

1/2p=36

p=36*2

p=72

72 (I NEEDED MORE CHARACTERS)

please only answer if you know i've failed this test twice and i need help

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Answer:

C

Step-by-step explanation:

.......

pls help me with this !!!!! it is urgent

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the answer is 1A definitely

The box plot below shows the total amount of time, in minutes, the students of a class surf the Internet every day:
A box plot is shown. The left-most point on the plot is 20 and the right-most point is 95. The box is labeled 40 on the left edge and 60 on the right edge. A vertical line is drawn inside the rectangle at the point 50.

Part A: Describe the shape of the box plot. (4 points)

Part B: What percent of the data is above 60 minutes? (2 points)

Part C: Calculate the interquartile range of the data, and explain in a sentence or two what it represents.

Answers

It’s 1/2 minutes I believe
the answer is 1/2 minutes

PLEASE HELP ME!! question below

Answers

Answer:

625??

Step-by-step explanation:

Answer:

If you used π, 157.079632679 yards or 157.08 yards rounded to the hundredths place. If you used 3.14, the answer is 157 yards.

Step-by-step explanation:

The formula to find the perimeter of a circle is P=2×π×r.

Step 1: Find the radius. In this case, the radius is 25 yards as shown in the diagram.

Step 2: Since the formula only includes multiplication, you can multiply any of the factors. For simplicity, multiply your radius by 2 first. In this case, 2×25=50.

Step 3: Multiply your last number with π. In this case, 50×π=157.079632679 or 157.08 rounded the hundredths place. 50×3.14=157.

Step 4: You found the answer! Hope this helps.

If the volume of a prism is 18 in3, what is the volume of a pyramid with the same base area and height?
Group of answer choices

6 in3

36 in3

9 in3

54 in3

Answers

The answer is 54 in3 hope this helps

Do any of y'all know how to do this I'm so confused and I need help ​plz

Answers

i think the answer is 8.625! u just find the area of each individual shape and add them together lol
The answers is 8.625ft

Find the area of the parallelogram.

Answers

It’s 4.5
Bxh
Pls mark me brain liest

How do I graph a slope intercept form equation?

Ex.
y= -5/3 x-2

Answers

0 = -5/3x -2
0= 5x - 6
5x = 6
x= -6/5
X= -6/5 hope it helps

PLEASE PLEASE PLEASE HELP I WILL GIVE BRAINLIEST

Answers

3. X-3+5
4. X-3x or x-1-2 if you don't use x replace it for 0

hope this helps
3.)x-3+5
4.)x-3x or x-1-2

Ok I know i was told it was false on the last one but I still don’t really understand the answer tho

Answers

Answer:It’s false

Step-by-step explanation:

because it goes over 7 feet and they wanted exactly 7 feet

Kurt added 3/4 of a cup of yellow raisins and 1/3 of a cup of black raisins to a batch of trail mix. How many cups of raisins did Kurt add in all?

Answers

Answer:5/12

Step-by-step explanation:

The answer is 5/12 , hope this helps

pllllleasee helpddddddddddddddddd

Answers

Answer:

A

Step-by-step explanation:

Answer : A

explanation :

Ok guy a few more that i need help with!/3 mi.=_yd./24 in.=_ft/26 yd.=_in. Thanks if you know some!!

Answers

Answer:

3 mi = 5280 yd./ 24 in = 2 ft./ 26 yd = 936 in

Step-by-step explanation:

Yo can someone help me with this problem?

Answers

Answer:

1. 8m = 800 cm

area = 5 x 800 = 4000 / 2

= 2000 cm

2. 10 x 14 = 140

140 / 2

= 70 cm

Step-by-step explanation:

Relative frequencies are calculated as _____________.

Percentages
Medians
Ranges
Totals

Answers

they’re calculated as percentages fractions and decimals

Relative frequencies are calculated as totals.

Here, we have,

In statistics, relative frequency refers to the proportion or percentage of times a particular value or category appears in a dataset relative to the total number of observations or data points.

It is a way to express the frequency of a value or category in relation to the whole dataset.

To calculate the relative frequency, you divide the frequency (number of times a value or category occurs) by the total number of observations or data points.

This gives you the proportion or percentage of occurrences relative to the total.

For example, if you have a dataset of 100 observations and a specific value appears 20 times, the relative frequency of that value would be 20/100 or 0.20, which is 20%.

So, relative frequencies are calculated as totals by comparing the specific frequency of a value or category to the total number of observations in the dataset.

To know more about frequency, visit here:

brainly.com/question/5102661

#SPJ4

John went to the deli and ordered 4 subs for $39. What would the cost be if John ordered 7 subs? (Solve using a proportion)

Answers

you would divide 39/4 which gives you 9.75. Then you would multiply 9.75 x 7 which equals $68.25
68.25 because if you divide 4 by 39 and then multiple that answer by 7 then you get 68.25

anybody best oen gets brainlyest

Answers

Answer:

C - 300

Step-by-step explanation:

That’s where the middle box line is

300 but at the same time there is calculations needed

Pls help!!! ASAP!!! (Middle School Math)

Answers

See attachment for reply and answer.

250 cubic unites were gonna multiply it all because its volume

What is the area of a circle?
A. The distance around a circle.
B. The space inside the circle.
C. A line from side to side passing through the center.
D. A line from the center to the side.

Answers

Answer:

A.The distance around the circle

The graph shows information about the lion population at a safari park. Lions were introduced in the park in 2010. In 2012, the park has a population of 32 lions. A year later, in 2013, the park has 128 lions. Write an exponential function that models this situation. Let X represent the number of years since 2010 and let f(x)represent the number of lions.

Answers

Answer:

never gonna

Step-by-step explanation:

give you up,

Let you down,

make you cry

Run around and desert you

answer asap please and thank you

Answers

Answer:

you need to multiply the numbers

Step-by-step explanation:

1/5 ×2/5= 2/25

Answer:

use X

Step-by-step explanation:

I'm kind of skeptical because none of them seem right to me, but X would be the one that makes more sense.

Can I Get Some Help Pls

Answers

Answer:

im preety sure D = 2

Step 2-by-step explanation:

The answer is 20 miles

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And please do a real answer. And don't use any links.

Answers

Answer:

B = [tex]\frac{3x}{y}[/tex] - [tex]\frac{2}{y}[/tex]

Anyone please help :( ​

Answers

Answer:

4x + 10

----------

The answer is:


4x+10

Help with Math please

Answers

Answer:

the answer is 2,3,4

Step-by-step explanation:

Identify where the given information is sufficient for graphing a linear equation. Check all that apply.
one point and the slope of the line
one point
one of the intercepts and the slope of the line
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Answers

Answer:

The answer is A..C..D..E :)

Answer:

This person above me it is A,C,D,and E

Step-by-step explanation:

For the school dance only three members from the student government sold tickets, James, Mike and Bonnie. James sold ten more tickets than Bonnie, and Bonnie sold twice as many tickets as Mike. Let t represent the total number of tickets Mike sold.A total of 295 tickets were sold for the dance. Using the information above, write an algebraic equation to calculate how many tickets Mike, Bonnie, and James sold individually.

Answers

Answer:

Step-by-step explanation:

So if Bonnie sold twice as many tickets as mike and he sold 295 all you have to do is 295+295 wich is 590 so Bonnie sold 590 tickets, now to get how many ticket James sold add 10 to 590which is 600 so in short Bonnie sold 590 tickets and James sold 600 tickets. Hope this helps

please help this is another one I really don't understand!!

It requires 1/4 of a credit to play a video game for one minute.
a. Emma has 7/8 credits. Can she play for more or less than one minute? Explain how you know.
b. How long can Emma play the video game with her 7/8 credits.

Answers

1/4 is the same as 2/8. Since emma has 7/8 credits, she can’t play another minute, since 7+2 would be 9 (bigger than 8).

She can play the video game for half a minute, because 1/8 (how much she can use) is half of 2/8, Which would be a whole minute
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