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2x plus 7z equals 64 8y plus 6z equals 40 3x-2y plus 4z equals 46?
Wiki User
∙ 14y ago
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.
Wiki User
∙ 14y ago
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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 40 plus 40 plus 40 equals?
120
What is 36 plus 35 plus 40 plus 40 plus 40 plus 40 plus 40 equals?
36 + 35 + 40 + 40 + 40 + 40 + 40 = 271 271 is the answer
25x Square plus 40 plus 15?
25x (square) plus 40 plus 15 equals 680.
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
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
10-3x equals x-2x plus 40?
10 - 3x = x - 2x + 40 10 - 3x = - x + 40 10 - 40 = 3x - x -30 = 2x -15 = x
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
2x plus 9 equals 49 -3x?
2x+9 = 49-3x 2x+3x = 49-9 5x = 40 x = 8
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
6x-52 equals 4x plus 40?
6x-52 = 4x+40 6x-4x = 40+52 2x = 92 Answer: x = 46
What is the answer to 8x-40 equals 2x plus 2?
7. 8x-40=2x+2 4x-20=1x+1 3x-21=0 3x=21 therefore x=7
What is the answer to 2x equals 40?
x=20
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.
X squared plus 2x plus 40 equals x squared-x plus 190 what is the value of x?
x^2+2x+40 = x^2-x+190Subtract x^2 from both sides2x+40 = -x+190Add x to both sides3x + 40 = 190Subtract 40 from each side3x = 150Divide both sides by 3x = 50
