Solve the following system of equations by the substitution method.
8x = 2y + 5
3x = y + 7

Question

Asked 11/25/2014 9:04:03 AM

Updated 11/26/2014 2:15:30 AM

2 Answers/Comments

This conversation has been flagged as incorrect.

Flagged by janezeshun [11/26/2014 2:12:40 AM]

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emdjay23|Points 18164|

-(2x - 5) = 4; -2x + 5 = 4; -2x = 4 - 5; -2x = -1; x = 1/2

- - -

(2x - 5) = 4; 2x = 4 + 5; 2x = 9; x = 9/2,

x = 1/2 or x = 9/2

Question

Asked 11/25/2014 9:04:03 AM

Updated 11/26/2014 2:15:30 AM

2 Answers/Comments

This conversation has been flagged as incorrect.

Flagged by janezeshun [11/26/2014 2:12:40 AM]

Rating

5

5 - x = 7 - 2x could be the result of using the comparison method to solve the system shown: x + y = 5 , 2x + y = 7 .

Equation 1 : x + y = 5 , so y = 5 - x

Equation 2 : 2x + y = 7 , so y = 7 - 2x

And 5 - x = 7 - 2x

Equation 1 : x + y = 5 , so y = 5 - x

Equation 2 : 2x + y = 7 , so y = 7 - 2x

And 5 - x = 7 - 2x

Added 11/26/2014 2:12:16 AM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [11/26/2014 2:30:01 AM]

5

For the following system, use the second equation to make a substitution for x in the first equation : x + 5y - 10 = 0 , x = 2y - 8 , we get 7y - 18 = 0 , so the solutions is x = -20/7 , y = 18/7 .

x + 5y - 10 = 0

2y - 8 + 5y - 10 = 0

7y - 18 = 0

y = 18/7

x = 2*18/7 - 8

x = 36/7 - 56/7

x = - 20/7

x + 5y - 10 = 0

2y - 8 + 5y - 10 = 0

7y - 18 = 0

y = 18/7

x = 2*18/7 - 8

x = 36/7 - 56/7

x = - 20/7

Added 11/26/2014 2:15:30 AM

3x + 1 User: Factor 25x 2 + 10x + 1. **Weegy:** the answer is (1+5 x)^2 **User:** The length of a rectangle is 3 more than twice the width. The area of the rectangle is 119 square inches. What are the dimensions of the rectangle?
If x = the width of the rectangle, which of the following equations is used in the process of solving this problem?
**Weegy:** The equations used in the process of solving this problem is 2x^2 + 3x - 119 = 0. **User:** Given: x - 7 > -2. **User:** A ball is dropped from a treetop 256 feet above the ground.
How long does it take to hit the ground? (s = 16t 2) **Weegy:** the ball would take about 4 seconds to hit the ground **User:** Factor the following polynomial completely.
-x 2 y 2 + x 4 + 9y 2 - 9x 2 **User:** Solve 7x + 1 **Weegy:** (7x - 6)^2 = (7x - 6)(7x - 6) = 49x^2 - 42x - 42x + 36; = 49x^2 - 84x + 36 **User:** One person can do a certain job in twenty-one minutes, and another person can do the same job in twenty-eight minutes.
How many minutes will it take them to do the job together?
**Weegy:** 12 min **User:** y(y + 4) - y = 6 is a quadratic equation. (More)

Question

Not Answered

Updated 11/21/2014 7:07:16 PM

4 Answers/Comments

3x + 1 < 7

3x < 7 - 1

3x < 6

x < 6/3

x < 2 .

3x < 7 - 1

3x < 6

x < 6/3

x < 2 .

Added 11/21/2014 7:00:47 PM

This answer has been confirmed as correct and helpful.

Confirmed by andrewpallarca [11/22/2014 1:03:25 AM], Rated good by andrewpallarca

x - 7 > -2

x > -2 + 7

x > 5

x > -2 + 7

x > 5

Added 11/21/2014 7:01:33 PM

This answer has been confirmed as correct and helpful.

Confirmed by andrewpallarca [11/22/2014 1:03:45 AM], Rated good by andrewpallarca

7x + 1 < 4(x - 2)

7x + 1 < 4x - 8

7x - 4x < -8 - 1

3x < -9

x < -3

7x + 1 < 4x - 8

7x - 4x < -8 - 1

3x < -9

x < -3

Added 11/21/2014 7:02:57 PM

This answer has been confirmed as correct and helpful.

Confirmed by andrewpallarca [11/22/2014 1:04:20 AM], Rated good by andrewpallarca

y(y + 4) - y = 6 is a quadratic equation is true.

y(y + 4) - y = 6

y^2 + 4y - y = 6

y^2 + 3y = 6

y(y + 4) - y = 6

y^2 + 4y - y = 6

y^2 + 3y = 6

Added 11/21/2014 7:07:14 PM

This answer has been confirmed as correct and helpful.

Confirmed by andrewpallarca [11/22/2014 1:04:52 AM], Rated good by andrewpallarca

x + y = k
x - y = k **Weegy:** 8 1/3 - 1 5/6 = 25/3 - 11/6; = 50/6 - 11/6; = 39/6; = 13/2; = 6 1/2 **User:** 5x + y = 6
5x + 3y = -4 **Weegy:** -4(2x + 3y) + 5x = -8x - 12y + 5x; = -3x - 12y **User:** 3x + 5y = 78
2x - y = 0
The point of intersection of the lines has an x-coordinate of ___.
**Weegy:** 6 is correct **User:** 3x - 4y = 6
6x - 8y = 10
The system shown has _____ solution(s).
**Weegy:** The system shown has no solution(s). **User:** 3x - 4y = 7
3x + 2y = -5
When the second equation is subtracted from the first, the resulting equation is _____.
**Weegy:** 4x - 4y = 10 divided by 2 on both sides the result is: 2x - 2y = 5 (equ. 1) 3x + 2y = 5 (equ. 2) adding up equations 1 and 2 the result is: 5x = 10 x = 10/5 = 2 4(2) - 4y = 10 -4y = 10 - 8 = 2 y = 2/-4 = -1/2 The solution for the system 4x - 4y = 10 3x + 2y = 5 is (2, -1/2) **User:** x + 5y = -2
2x + y = 5
The point of intersection of the lines has a y-coordinate of ___.
**Weegy:** y-coordinate of -1 **User:** 2x + 3y = 6
5x + 2y = 4
Which of the following equations could be the result of multiplication and addition to eliminate a variable in the system of equations?
**Weegy:**
c. 11y = 22
(More)

Question

Updated 11/26/2014 1:28:16 AM

4 Answers/Comments

The solution for x + y = k , x - y = k is x = k , y= 0 .

Equation 1 add equaiton 2 ,

x + y + x - y = k + k ,

2x = 2k ,

x = k ,

k + y = k ,

y = k - k ,

y = 0 .

Equation 1 add equaiton 2 ,

x + y + x - y = k + k ,

2x = 2k ,

x = k ,

k + y = k ,

y = k - k ,

y = 0 .

Added 11/26/2014 1:21:13 AM

This answer has been confirmed as correct and helpful.

Confirmed by sujaysen [11/26/2014 8:13:49 AM]

The solution for 5x + y = 6 , 5x + 3y = -4 is x = 11/5 , y = -5 .

Equation 1 minus equation 2 ,

5x + y - 5x - 3y = 6 - (-4) ,

-2y = 10 ,

y = -5 ,

5x - 5 = 6 ,

5x = 6 + 5 ,

x = 11/5 .

Equation 1 minus equation 2 ,

5x + y - 5x - 3y = 6 - (-4) ,

-2y = 10 ,

y = -5 ,

5x - 5 = 6 ,

5x = 6 + 5 ,

x = 11/5 .

Added 11/26/2014 1:23:33 AM

This answer has been confirmed as correct and helpful.

Confirmed by sujaysen [11/26/2014 8:15:04 AM]

3x - 4y = 7 , 3x + 2y = -5 When the second equation is subtracted from the first, the resulting equation is -6y = 12 .

3x - 4y - (3x + 2y) = 7 - (-5) ,

3x - 4y - 3x - 2y = 12 ,

-6y = 12 .

3x - 4y - (3x + 2y) = 7 - (-5) ,

3x - 4y - 3x - 2y = 12 ,

-6y = 12 .

Added 11/26/2014 1:26:34 AM

This answer has been confirmed as correct and helpful.

Confirmed by sujaysen [11/26/2014 8:18:25 AM]

7x - 3y = 4
2x - 4y = 1
The solution to the system of equations is _____. User: 2x + y = -2
x + y = 5
The x-coordinate of the solution to the system shown is ___.
**Weegy:** 2x + y = -2 x + y = 5 The x-coordinate of the solution to the system shown is -7 **User:** x - y = 4
x + y = 8
The x-coordinate of the solution to the system shown is ___. **Weegy:** The answer is 4 **User:** 7x - 3y = 4
2x - 4y = 1
Which of the following systems is not the same as solving the system shown? (More)

Question

Updated 11/26/2014 2:08:19 AM

1 Answer/Comment

x - y = 4 , x + y = 8 The x-coordinate of the solution to the system shown is 6.

Equation 1 add equation 2

x - y + x + y = 4 + 8

2x = 12

x = 12/2

x = 6

Equation 1 add equation 2

x - y + x + y = 4 + 8

2x = 12

x = 12/2

x = 6

Added 11/26/2014 2:07:52 AM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [11/26/2014 2:37:31 AM]

Solve 3(x - 2) **Weegy:** 3(x - 2) **User:**
Select the correct solution set.
x + 17 -3
{x | x -20}
{x | x 14}
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Select the correct solution set.
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{x | x -20}
{x | x 14}
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Select the correct solution set.
50 15x
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{x | x 10/3}
{x | x > 10/3} **User:**
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{x | x R, x > 1}
{x | x R, x 1}
{x | x N, x 1} **Weegy:** {x | x N, x >1} is equal to {1, 2, 3, ...} **User:**
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closed circle on 2 and all numbers to the left shaded
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Select the correct solution set.
-7x 56
{x | x -8}
{x | x -8}
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x/2 = 6 , x = 2(6) , x = 12 (answer) **User:**
The minimum height for riding on the Super Screaming Spinner at the theme park is 52 inches.
Which of the following expressions shows the height to ride?
h 52
h 52 **Weegy:** C. H > 52. The height has to be 52 inches or greater to ride. Technically, this should have a line under the inequality. **User:**
Choose the true statement about the graph of x < 4.
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Question

Updated 11/18/2014 8:29:09 PM

2 Answers/Comments

3(x + 2) > x

3x + 6 > x

3x - x > -6

2x > -6

x > -3

3x + 6 > x

3x - x > -6

2x > -6

x > -3

Added 11/18/2014 8:28:36 PM

This answer has been confirmed as correct and helpful.

Confirmed by yumdrea [11/18/2014 8:42:04 PM]

The true statement about the graph of x < 4 is: open circle on 4 and all numbers to the left shaded

Added 11/18/2014 8:29:09 PM

This answer has been confirmed as correct and helpful.

Solve the following system of equations.
3x + 2y - 5 = 0
x = y + 10 **Weegy:** 3x + 2y - 5 = 0 x = y + 10 substitute x in the first equation: 3(y + 10) + 2y - 5 = 0 3y + 30 + 2y - 5 = 0 5y + 25 = 0 y = -5 x = -5 + 10 = 5 The solution for the system 3x + 2y - 5 = 0 x = y + 10 is (5, -5) (More)

Question

Updated 11/25/2014 12:41:59 PM

0 Answers/Comments

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