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
Helga [31]
3 years ago
14

Can someone help me on these two questions please for 86 points and i'll award someone the brainiest

Mathematics
2 answers:
Minchanka [31]3 years ago
8 0

Answer:

1)   x = 1,   y = 5

2)   x = -7 , y = 21

Step-by-step explanation:

1) 5x + 2y = 13

     x + 2y = 9

5x + 2y - 13 = x + 2y - 9

combine like terms:

5x - x + 2y - 2y - 13 + 9 = 0

4x - 4 = 0

x = 4 / 4

x = 1   ----------plug in x=1 on equation x + 2y = 9

1 + 2y = 9

y = 10 / 2

y = 5

therefore x = 1, y = 5

-----------------------------------------

2)  2x + y = 7

    5x - y = 14

combine like terms:

2x + y -7 - 5x - y - 14 = 0

-3x - 21 = 0

x = 21/-3

x = -7  ----------plug in x=-7 on equation 2x + y = 7

2(-7) + y = 7

-14 + y = 7

y = 7 + 14

y = 21

therefore x = -7 , y = 21

12345 [234]3 years ago
3 0
5x +  2y = 13
 x  +  2y  = 9

Subtract  :-  ( note that 2y - 2y = 0):-

4x  + 0 = 4
x = 1 

From 2nd equation plug in x = 1

1 + 2y = 9
2y = 8
y = 4   

Solution to this equation is  x=1,y=4



2x + y = 7
5x - y = 14

Adding eliminates the y  terms because y + -y = 0 :-

7x + 0 = 21
7x = 21
x = 3

Plug x=3 into second equation:-

5(3) - y = 14 
y = 15-14 = 1

solution is x =3, y = 1
You might be interested in
I'm really struggling with this question. Please help!
gavmur [86]
I got 23 u might want to check it tho
3 0
3 years ago
4friends shared a pitcher of juice 6/24 2/16 5/16 4/32 which 2 would have drank 1/4 of the juice
Annette [7]
6/24 and 5/16 are the two friends who would have drank 1/4 of the juice.
3 0
3 years ago
Can someone please help me answer these questions
Fittoniya [83]

Answer:

sue had the busiest day of all

7 0
2 years ago
Help please!!! I’ll mark u as brainliest
sergeinik [125]

Answer:

Answer is below

Step-by-step explanation:

Yes, the graph would still be a function, but a different function than if the values were all different. This would cause two of the values to be the same and have no slope on the line. Before, the function was quadratic, but now it would be quadratic until the two values are equal.

7 0
3 years ago
Can someone plz help me with this!
asambeis [7]

Answer:

(arranged from top to bottom)

System #3, where x=6

System #1, where x=4

System #7, where x=3

System #5, where x=2

System #2, where x=1

Step-by-step explanation:

System #1: x=4

2x+y=10\\x-3y=-2

To solve, start by isolating your first equation for y.

2x+y=10\\y=-2x+10

Now, plug this value of y into your second equation.

x-3(-2x+10)=-2\\x+6x-30=-2\\7x=28\\x=4

System #2: x=1

x+2y=5\\2x+y=4

Isolate your second equation for y.

2x+y=4\\y=-2x+4

Plug this value of y into your first equation.

x+2(-2x+4)=5\\x+(-4x)+8=5\\x-4x+8=5\\-3x=-3\\x=1

System #3: x=6

5x+y=33\\x=18-4y

Isolate your first equation for y.

5x+y=33\\y=-5x+33

Plug this value of y into your second equation.

x=18-4(-5x+33)\\x=18+20x-132\\-19x=-114\\x=6

System #4: all real numbers (not included in your diagram)

y=13-2x\\8x+4y=52

Plug your value of y into your second equation.

8x+4(13-2x)=52\\8x+52-8x=52\\0=0

<em>all real numbers are solutions</em>

System #5: x=2

x+3y=5\\6x-y=11

Isolate your second equation for y.

6x-y=11\\-y=-6x+11\\y=6x-11

Plug in your value of y to your first equation.

x+3(6x-11)=5\\x+18x-33=5\\19x=38\\x=2

System #6: no solution (not included in your diagram)

2x+y=10\\-6x-3y=-2

Isolate your first equation for y.

2x+y=10\\y=-2x+10

Plug your value of y into your second equation.

-6x-3(-2x+10)=-2\\-6x+6x-30=-2\\-30=-2

<em>no solution</em>

System #7: x=3

y=10+x\\2x+3y=45

Plug your value of y into your second equation.

2x+3(10+x)=45\\2x+30+3x=45\\5x=15\\x=3

3 0
3 years ago
Other questions:
  • The sum of 5 consecutive numbers is 135
    9·1 answer
  • For what value of the variable will<br> b<br> the value of 3−5c be 1 less than the value of 1−c?
    14·1 answer
  • Which of the following is true about the age of rock layers and the age of the Earth? A. All rock layers are older than the Eart
    12·1 answer
  • Please help !
    7·1 answer
  • Factor the Expression x^2-8x-16
    11·1 answer
  • A small box of chocolates weighs a fifth a large box of chocolates. The difference in weight between a small box of chocolate an
    9·1 answer
  • Solve the equation<br><br>n/2 = -7​
    15·2 answers
  • I need help asap......!!!!!!!!!!!!!
    6·2 answers
  • Trying this again for another 30 point and brainly
    13·2 answers
  • What is the solution to it please help.<br>3n + 4n - 2 = 15​
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!