Mathematics, 19.08.2019 05:30, ktyree100

Solve using addition method
3x-3y+2z=7
3x+y-3z=-5
7x-y-2z=0

Answers: 1

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Answers

3x - 3y + 2z = 7
3x + 1y - 3z = -5 ⇒ 6x - 2y - 1z = 2 ⇒ 42x - 14y -   7z = 14
7x - 1y - 2z = 0   ⇒ 7x - 1y - 2z = 0 ⇒ 42x -   6y - 12z = 0
      -20y - 19z = 14
          -20y + 20y - 19z = 14 + 20y
         -19z = 14 + 20y
          -19    -19
      z = -14/19 - 1 1/19y
       3x - 3y + 2(-14/19 - 1 1/19y) = 7
   3x - 3y - 1 9/19 - 2 2/19y = 7
           3x - 5 2/19y - 1 9/19 = 7
       +1 9/19 +1 9/19
       3x - 5 2/19y = 8 9/19
        3x - 3x - 5 2/19y = 8 9/19 - 3x
         -5 2/19y = 8 9/19 - 3x
       -5 2/19 -5 2/19
       y = -1 64/97 + 57/97x
       3x - 3(-1 64/97 + 57/97x) + 2(-14/19 - 1 1/19y) = 7
      3x + 4 95/97 + 1 74/97x - 1 9/19 - 2 2/19y = 7
   4 74/97x - 2 2/19y + 3.5056972328 = 7
   -3.5056972328   -3.5056972328
      4 74/97x - 2 2/19y = 3.494302767
      4 74/97x + 2 2/19y - 2 2/19y = 3.494302767 + 22/19y
      4 74/97x = 3.494302767 + 2 2/19
       4 74/97    4 74/97
       x = 0.7336523126 + 0.4420141262y
3(0.733652316 + 0.4420141262y) - 3(-1 64/97 + 57/97x) + 2(-14/19 - 1 1/19y)=7
    2.200956948 + 1.326042379y + 4 95/97 - 1 74/97x - 1 9/19 - 2 2/19y = 7    -1 74/97x - 0.7792207789y + 5.706654181 = 7
      -5.706654181    -5.70665418
   -1 74/97x - 0.7792207789y = 1.293345820
(x, y, z) = (0.733652316 + 0.4420141262, -1 64/97 + 57/97x, -14/19 - 1 1/19y)

answered: Guest

the correct answer is the second option

With this question! i will mark brainliest if correct!

answered: Guest

95.03 is the answer. hope this !

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Solve using addition method
3x-3y+2z=7
3x+y-3z=-5
7x-y-2z=0...