answersLogoWhite

0


Best Answer

Solve by the substitution method the given system of the linear equations of 3 variables.

2x + 7z = 64

8y + 6z = 40

3x - 2y + 4z = 46 (add the first equation with the second equation)

2x + 8y + 13z = 104

3x - 2y + 4z = 46 (multiply the second equation by 4)

2x + 8y + 13z = 104

12x - 8y + 16z = 184 (add both equations)

14x + 29z = 288

14x + 29z = 288

2x + 7z = 64 (multiply the second equation by -7)

14x + 29z = 288

-14x - 49z = -448 (add both equations)

-20z = -160 (divide both sides by -20)

z = 8

2x + 7z = 64 (substitute 8 for z)

2x + 7(8) = 64

2x + 56 = 64 (subtract 56 to both sides)

2x = 8(divide by 2 to both sides)

x = 4

8y + 6z = 40 (substitute 8 for z)

8y + 6(8) = 40

8y + 48 = 40 (subtract 48 to both sides)

8y = -8 (divide by 8 to both sides)

y= -1

Thus, the solutions are x = 4, y = -1, and z = 8.

User Avatar

Wiki User

โˆ™ 2010-01-10 22:01:03
This answer is:
๐Ÿ™
0
๐Ÿคจ
0
๐Ÿ˜ฎ
0
User Avatar
Study guides

๐Ÿ““
Create a Study Guide

Add your answer:

Earn +20 pts
Q: 2x plus 7z equals 64 8y plus 6z equals 40 3x-2y plus 4z equals 46?
Write your answer...
Submit
Related questions

3x plus 2x equals 40?

3x + 2x = 40 5x = 40 x = 8


2x plus 3y equals 40 and -2x plus 2y equals 20?

Add the two equations you get 5y = 60 so y = 12 and x = 2


If 2x plus 2x equals 40 what does x equal?

To solve for x, set up the equation: 2x +2x = 40 (then simplify) 4x = 40 (then divide both sides of the equation by 4) x = 10 (this is the answer)


Solve by the method of elimination 2x plus 3y equals 40 3x plus 2y equals 20?

y=16 x= -4


10-3x equals x-2x plus 40?

10 - 3x = x - 2x + 40 10 - 3x = - x + 40 10 - 40 = 3x - x -30 = 2x -15 = x


What is the answer to 2x squared -2x -40 equals 0 is it x equals 5 and x equals -4?

Yes it is and well done.


What is the answer to 2x equals 40?

x=20


What is 40 plus 40 plus 40 equals?

120


2x plus 9 equals 49 -3x?

2x+9 = 49-3x 2x+3x = 49-9 5x = 40 x = 8


What is 36 plus 35 plus 40 plus 40 plus 40 plus 40 plus 40 equals?

36 + 35 + 40 + 40 + 40 + 40 + 40 = 271


What is the value of x in the equation 2x plus 17 equals 6x-23?

2x+17=6x-23 23+17=6x-2x 40=4x x=40 / 4 therefore x=10


What is 10y plus 40?

10y plus 40 equals 50y.


What is 40 plus 40 plus 40 plus 40 plus 40 plus 40 plus 40 plus 40 plus 70 plus 74 plus 85 plus 45 plus 27 plus 56 plus 84 plus 57?

this equals 818


What duse 100 plus 40 plus 100 plus 40 equals?

280


40 plus x equals 25?

If 40 plus x equals 25 then x is equal to -15.


6x-52 equals 4x plus 40?

6x-52 = 4x+40 6x-4x = 40+52 2x = 92 Answer: x = 46


How do you work out 2x plus 43 equals 5x plus 13?

well you first get the 43 and take away 3 to make it 40, then you divide it by 8 to give you 5 so thats how 2x becomes 5x. Then you add 2 x 5 which = 10 then you add the 3 that was taken away from the 40 so you come out with the solution of: 2x + 43 = 5x + 13.


What point lies on the line y plus 5 equals 2x-10?

An infinite number of points lie on that line. One such would be (40, 65).


2x-3y-7y plus 4x-5 when x equals 10 and y equals 4?

2x-3y-7y+4x-5=6x-10y-5=6*10-10*4-5=60-40-5=60-45=15


What is 10 plus 20 plus 30 plus 40 plus 50?

10 plus 20 plus 30plus 40 plus 50 equals 150 because 50 plus 40 equals 90 plus 30 =120+20= 140 then + 10 = 150


40 percent of 125 jumpers equals X 25 percent of trousers equals Y What does 10 percent of 2X equal?

since X = 40% , 2X = 80% therefore 10% of 2X = 8% 8% of 125 = 10


25x Square plus 40 plus 15?

25x (square) plus 40 plus 15 equals 680.


What plus 29 equals 40?

11 + 29 = 40


EO equals 2X minus 20 and OC equals 70 minus X solve for X?

40


What is 20 plus 20?

20 plus 20 equals 4020 plus 20 = 40