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
andreyandreev [35.5K]
3 years ago
15

Solve the system using substitution. 3x+5y=15 2x+4y=8

Mathematics
1 answer:
Minchanka [31]3 years ago
7 0

Answer:

x=10

y=-3

Step-by-step explanation:

3x + 5y= 15...eqn. 1

2x + 4y= 8...eqn. 2

multiply eqn. 1 by 2 and eqn. 2 by 3

6x + 10y = 30...eqn. 3

<u>6x</u><u> </u><u>+</u><u> </u><u>12y</u><u> </u><u>=</u><u> </u><u>24...eqn. 4</u>

0 - 2y = 6

divide both sides by the coefficient of y which is -2

<u>- 2y</u> = <u>6</u>

- 2 -2

y= -3

Put y= -3 into eqn. 1

3x + 5(-3) = 15

3x - 15 = 15

3x =15 + 15

<u>3x</u> =<u> 30</u>

3 3

x = 10

Therefore X= 10 and Y= -3

You might be interested in
Which ordered pair represents the solution to the system of equations? {4x−2y=18−3x−4y=−8 (4, −1) (5, 1) (−1, 4) (43, 1)
Ilia_Sergeevich [38]

Answer:

A g imma need the answer too

Step-by-step explanation:

6 0
3 years ago
If you know this answer can you help lol
AnnyKZ [126]

The answer is C whole

4 0
3 years ago
If x^(2) = 64 and y^(2)= 121 what is the value of x-y?
GalinKa [24]

Step-by-step explanation:

<em>the value of x is 8</em>

8^(2) = 64

the value of y is 11

11^(2) = 121

x - y

= 8 - 11

= -3

<h3>#CMIIW</h3>

3 0
2 years ago
Toy-rific Toy Store received a shipment of glow-in-the-dark bracelets.
MaRussiya [10]

Answer: 12

Step-by-step explanation:

106.80/8.90 =12

3 0
2 years ago
Solve for x in the following:<br> 8x^2 + 6x = -5
artcher [175]

Answer:

No solution or

(-3±2i\sqrt{31})/8

Step-by-step explanation:

To get the solution, move everything to the left side of the equation:

8x²+6x+5 = 0

If you try to factor the equation or graph it, you will see that it will never equal 0.

If you need an imaginary solution you can plug it into the quadratic equation:

-6±\sqrt{36-160} over 16

Simplify and you get

-6±i\sqrt{124} over 16

-6±4i\sqrt{31} over 16

Simplify the fraction and you can get

(-3±2i\sqrt{31})/8

8 0
3 years ago
Other questions:
  • Help..? ill give you a lot of points
    8·2 answers
  • What are the first 100 numbers of pi
    7·2 answers
  • una tienda de ropa realiza un descuento de 5% por toda compra,si un pantalon sin descuento cuesta 420 pesos cuanto pagare por el
    14·1 answer
  • Which is the better buy 6 bagels for $3.29 or 8 bagels for $4.15
    13·1 answer
  • Tim bought 7 new baseball trading cards to add to his collection. The next day his dog ate half of his collection. There are now
    15·2 answers
  • Find the zeros of the function.
    13·2 answers
  • I need help w/ these two problems if you don't mind.
    13·2 answers
  • What is x + 3 = 10??
    14·2 answers
  • Find the interquartile range of the data displayed in the<br> box plot shown.
    5·2 answers
  • Which fraction does the colored portion of the picture represent?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!