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
gavmur [86]
3 years ago
8

Jill wants to solve the following system using the elimination method:

Mathematics
2 answers:
Mariulka [41]3 years ago
8 0

Answer:

-3

Step-by-step explanation:

To use the elimination method, we need the variable we want to eliminate to have the same coefficient number in both equations, but with the opposite sign. Thus, when adding the equations that variable will be eliminated.

The variable x in the first equation is the following:

x

and the x in the second equation is:

3x

So we must multiply the first equation by -3, so it becomes:

-3y = -3x + 8

and we can see that now, the x's in both equation have the same coefficient number but a different sign (one positive and one negative) which is what we need to apply the elimination method.

asambeis [7]3 years ago
5 0
-3 as in the first equation x = 1x so multiply it by -3 you’ll get -3x.
You might be interested in
Best answer gets Brainliest!!!
Murrr4er [49]

Answer:

The table C

Step-by-step explanation:

when you multiply the x number in the table c by 0.3 you get the same answer as the one in the y column. The constant of proportionality  is the value that stays constant in the ratio. Since when you multiply each number in the x column by 0.3 and you always get the number in the y column it shows that the table c is correct.

3 0
2 years ago
What’s a complex conjugate in math
goldenfox [79]

Answer:


Step-by-step explanation:

In mathematics, the complex conjugate of a complex number is the number with an equal real part and an imaginary part equal in magnitude but opposite in sign. For example, the complex conjugate of 3 + 4i is 3 − 4i. In polar form, the conjugate of is.

3 0
3 years ago
How long* sorry! Happy December 1st!!!
Sphinxa [80]

today is December 1

7 0
3 years ago
Read 2 more answers
A colony of bacteria is growing at a rate of 0.2 times its mass. Here time is measured in hours and mass in grams. The mass of t
11Alexandr11 [23.1K]

Answer:

  • <u>Question 1:</u>      dm/dt=0.2m<u />

<u />

  • <u>Question 2:</u>     m=Ae^{(0.2t)}<u />

<u />

  • <u>Question 3:</u>      m=10e^{(0.2t)}<u />

<u />

  • <u>Question 4:</u>      m=10g<u />

Explanation:

<u>Question 1: Write down the differential equation the mass of the bacteria, m, satisfies: m′= .2m</u>

<u></u>

a) By definition:  m'=dm/dt

b)  Given:  rate=0.2m

c) By substitution:  dm/dt=0.2m

<u>Question 2: Find the general solution of this equation. Use A as a constant of integration.</u>

a) <u>Separate variables</u>

     dm/m=0.2dt

b)<u> Integrate</u>

           \int dm/m=\int 0.2dt

            ln(m)=0.2t+C

c) <u>Antilogarithm</u>

       m=e^{0.2t+C}

       m=e^{0.2t}\cdot e^C

         e^C=A\\\\m=Ae^{(0.2t)}

<u>Question 3. Which particular solution matches the additional information?</u>

<u></u>

Use the measured rate of 4 grams per hour after 3 hours

            t=3hours,dm/dt=4g/h

First, find the mass at t = 3 hours

            dm/dt=0.2m\\\\4=0.2m\\\\m=4/0.2\\\\m=20g

Now substitute in the general solution of the differential equation, to find A:

          m=Ae^{(0.2t)}\\\\20=Ae^{(0.2\times 3)}\\\\A=20/e^{(0.6)}\\\\A=10.976

Round A to 1 significant figure:

  • A = 10.

<u>Particular solution:</u>

           

             m=10e^{(0.2t)}

<u>Question 4. What was the mass of the bacteria at time =0?</u>

Substitute t = 0 in the equation of the particular solution:

         m=10e^{0}\\\\m=10g

3 0
3 years ago
Mara put down 7.5% on the purchase of her new
sesenic [268]

Answer: $189 000

brainliest or a thank you please :))

goodluck!

6 0
3 years ago
Other questions:
  • What is the area of this figure?
    5·1 answer
  • Create a possible dot plot with at least 10 values for each of the conditions listed. Each dot
    14·1 answer
  • Help me! I need the surface area and volume please explain how you got that answer!
    5·1 answer
  • Can someone please help me with this question
    7·2 answers
  • А<br>A<br>8 cm<br>E<br>5 cm<br>B.<br>С C<br>D<br>12 cm​
    14·1 answer
  • GET 25 POINTS FOR THIS QUESTION AND ALSO BRAINLEST!!!!!
    9·1 answer
  • Go step by step to reduce the radical.<br> √ 128<br><br> √16 • √8<br><br> 8 √2<br><br> 8 √4 • √2
    9·1 answer
  • What is the unit rate
    13·1 answer
  • Free pts for you awesome people! Have a wonderful day!​
    8·2 answers
  • Write an equation for a line that passes through the point (2,9) that is parallel to the line y=5x-3.
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!