1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
igomit [66]
3 years ago
9

Which statement correctly explains how Dana can solve the following system of linear equations for x using the elimination metho

d?
4x+8y=20
-4x+2y= -30
Add the two equations, solve for y, and then substitute –1 for y to find x.
Multiply the bottom equation by –4, solve for y, and then substitute –1 for y to find x.
Multiply the bottom equation by –1, combine the two equations, solve for y, and then substitute 1 for y to find x.
Multiply the two equations, solve for y, and then substitute 1 for y to find x.
Mathematics
2 answers:
Vanyuwa [196]3 years ago
6 0
1. The correct statement is the first one, which is: <span>Add the two equations, solve for y, and then substitute –1 for y to find x.
</span>
 2. Therefore, you have the following system of equations:
<span>
 4x+8y=20
 -4x+2y= -30

 3. When you a</span>dd the two equations, and clear the variable "y", you obtain:

 10y=-10
 y=-1

 4. Now, you must substitute -1 for y (y=-1) to find x, as below:

 4x+8y=20
 4x+8(-1)=20
 4x-8=20
 4x=20+8
 4x=28
 x=28/4
 x=7
patriot [66]3 years ago
4 0

Answer:

A

Step-by-step explanation:

3dg 2020 answer

You might be interested in
In 1999, total revenue of a company from music sales and licensing was $14.1 billion. It was forecasted that this
katen-ka-za [31]

The percent decrease in the music revenue is 60.2%

<h3>How to calculate the percent decrease ?</h3>

Percent decrease can be described as the reduction in the value of a number.

In 1999, the revenue of the company was $14.1 billion

In 2014, the revenue of the company was $5.6 billion

The percent decrease can be calculated as follows

= 14.1 - 5.6/14.1 × 100

= 8.5/14.1 × 100

= 0.602 × 100

= 60.2 %

Hence the percent decrease is 60.2%

Read more here

brainly.com/question/16388605

#SPJ1

5 0
1 year ago
Chucky grabbed 11 1111 items in the grocery store that each had a different price and had a mean cost of about $ 4.44 $4.44dolla
maria [59]

Question:

Chucky grabbed 11 items in the grocery store that each had a different price and had a mean cost of about $4.44. On his way to the register, he gave in to an impulse to add a 12th item: an entire wheel of cheese that cost $39.99.

How will adding the wheel of cheese affect the mean and median?

Answer:

There will be a big difference in the mean when the new item is added

Step-by-step explanation:

Given

Items = 11

Mean = \$4.44

Before we solve further, we need to first calculate the total amount of the 11 items.

Mean = \frac{Total}{Items}

Make Total the Subject of formula

Total = Mean * Items

Total = \$4.44 * 11

Total = \$48.84

When the 12th item of $39.99 is added, the new mean becomes.

New\ Mean = \frac{Total + \$39.99}{11 + 1}

New\ Mean = \frac{\$48.84 + \$39.99}{11 + 1}

New\ Mean = \frac{\$88.83}{12}

New\ Mean = \$7.4025

By comparing this the old mean, we can see a huge increment between $4.44 and $7.4025

This means that there will be a big difference in the mean when the new item is added.

For the Median:

The old mean shows that the prices of the 11 items is within a small range from $4.44.

So, when the new item is added the median will only change a little bit.

In other words, the median value will only change a little bit.

7 0
2 years ago
Read 2 more answers
Solve 3^(4x+5)=(1/3)^(x+10) for x. Please show work
Naya [18.7K]

Answer:

Step-by-step explanation:

3^{4x+5}=(\frac{1}{3} )^{x+10}=\frac{1}{3^{x+10}} =3^{-x-10}\\so~4x+5=-x-10\\4x+x=-10-5\\5x=-15\\x=-3

4 0
3 years ago
Convert 8/12 as a decimal
Yakvenalex [24]

Answer:

Well you do what fraction says, 8 divided by 12 to get .6 repeating

3 0
3 years ago
Read 2 more answers
a group of friends are hiking on trail y when they reach an intersection with trail x. Trail x is perpendicular to trail y. If t
shusha [124]
I have the same question on a test I'm taking thanks
8 0
3 years ago
Other questions:
  • Can someone help me pls !!!
    5·2 answers
  • Whats the answer to 2)23 with the remainder
    8·1 answer
  • the cost to take a class at a local community college is $169 per credit. Write an expression to represent the cost o a class ba
    15·1 answer
  • 20% of your customers Call back within 72 hours Of their first call. Of those who call back, 10% call back again within 96 hours
    9·2 answers
  • helpppppp!!!!!!Nick has 3 shirts: a white one, a black one, and a blue one. He also has two pairs of pants, one blue and one tan
    13·2 answers
  • Find the value of Sin^-1(-√3/2)
    5·1 answer
  • Two parrallel lines were cut by a transversal.
    15·2 answers
  • ANSWER THE QUESTION IN THE PIC BELOW PLEASE
    5·1 answer
  • Please help me with this question!!
    14·1 answer
  • 8 decreased by the difference of t and 4
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!