2x y = 8
x y = 4

Question

Asked 3/15/2013 6:10:59 AM

Updated 4/1/2014 8:02:17 AM

10 Answers/Comments

This conversation has been flagged as incorrect.

Flagged by yeswey [4/1/2014 7:48:30 AM]

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6x - 18 = 30

6x = 30 + 18

6x = 48

x = 8

6x - 18 = 30

6x = 30 + 18

6x = 48

x = 8

6x - 18 = 30

6x = 30 + 18

6x = 48

x = 8

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Question

Asked 3/15/2013 6:10:59 AM

Updated 4/1/2014 8:02:17 AM

10 Answers/Comments

This conversation has been flagged as incorrect.

Flagged by yeswey [4/1/2014 7:48:30 AM]

Rating

3

If a = -12/5, then 5x + 2y = 6 and 3x - ay = 4 are parallel. FALSE.

For 5x + 2y = 6, the slope is -5/2;

For 3x - ay = 4, the slope is 3/a, when a = -12/5, slope = 3(-5/12) = -5/4

The slope of two lines are not the same so they are not parallel.

For 5x + 2y = 6, the slope is -5/2;

For 3x - ay = 4, the slope is 3/a, when a = -12/5, slope = 3(-5/12) = -5/4

The slope of two lines are not the same so they are not parallel.

Added 4/1/2014 7:42:59 AM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [4/1/2014 8:03:56 AM]

3

2x - 6y = 5

x + y = 2 - > y = 2 - x

Replace y with 2 - x in the first equation:

2x - 6(2 - x) = 5,

Simplify and solve the equation: x = 17/8

y = 2 - (17/8) = - 1/8

The solution for 2x - 6y = 5 x + y = 2 is (17/8, - 1/8)

x + y = 2 - > y = 2 - x

Replace y with 2 - x in the first equation:

2x - 6(2 - x) = 5,

Simplify and solve the equation: x = 17/8

y = 2 - (17/8) = - 1/8

The solution for 2x - 6y = 5 x + y = 2 is (17/8, - 1/8)

Added 4/1/2014 7:47:41 AM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [4/1/2014 8:03:58 AM]

3

The slope of the line that passes through the points (2, 1) and (-4, -5) is m = (-5 -1)/(-4 -2) = 1

Added 4/1/2014 7:49:38 AM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [4/1/2014 8:03:58 AM]

3

x + y = 6

x - y = 0

Adding two equations above: 2x = 6, so x = 3

y = x = 3

The solution set for the system of equations x + y = 6, x - y = 0 contains one point (3, 3)

x - y = 0

Adding two equations above: 2x = 6, so x = 3

y = x = 3

The solution set for the system of equations x + y = 6, x - y = 0 contains one point (3, 3)

Added 4/1/2014 7:51:59 AM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [4/1/2014 8:03:59 AM]

3

The y-intercept of the line whose equation is 3x + 2y = 7 is 7/2.

3x + 2y = 7

2y = -3x + 7

y = (-3/2)x + 7/2 which is the slope intercept form.

3x + 2y = 7

2y = -3x + 7

y = (-3/2)x + 7/2 which is the slope intercept form.

Added 4/1/2014 7:53:54 AM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [4/1/2014 8:04:00 AM]

3

The slope of the line whose equation is y - 3 = 0 is 0.

Added 4/1/2014 7:54:27 AM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [4/1/2014 8:04:00 AM]

3

6x - 2y = 5 (the 1st equation)

3x - y = 10 multiply 2 on both sides:

6x - 2y = 20 (the 2nd equation)

Subtracting the first and the second equation: 0 = - 15

Therefore, there is no slution for the system of equations 6x - 2y = 5 3x - y = 10

3x - y = 10 multiply 2 on both sides:

6x - 2y = 20 (the 2nd equation)

Subtracting the first and the second equation: 0 = - 15

Therefore, there is no slution for the system of equations 6x - 2y = 5 3x - y = 10

Added 4/1/2014 7:57:09 AM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [4/1/2014 8:04:01 AM]

3

x + y = 6

x - y = 8

Add the above two equations: 2x = 14, x = 7

7 + y = 6, so y = -1

The solution for the system of equations x + y = 6, x - y = 8 is (7, -1)

x - y = 8

Add the above two equations: 2x = 14, x = 7

7 + y = 6, so y = -1

The solution for the system of equations x + y = 6, x - y = 8 is (7, -1)

Added 4/1/2014 7:59:02 AM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [4/1/2014 8:04:02 AM]

3

The points (2, 1), (3, 3), (4, 5), and (5, 6) are collinear. FALSE.

Added 4/1/2014 8:02:17 AM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [4/1/2014 8:04:05 AM]

The points (2, 1), (3, 3), (4, 5), and (5, 6) are collinear.
true or flase?

Question

Expert Answered

Updated 3/22/2014 5:13:29 AM

1 Answer/Comment

The points (2, 1), (3, 3), (4, 5), and (5, 6) are collinear. FALSE.

Added 3/22/2014 5:13:29 AM

This answer has been confirmed as correct and helpful.

Confirmed by andrewpallarca [3/22/2014 6:26:31 AM]

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