Debby D

09 Desember 2022 05:59

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Debby D

09 Desember 2022 05:59

Pertanyaan

Tentukan himpunan penyelesaian dari A. 2x - 7y = 17 dan 3x + y = 14 B. 4x - y = - 11dan - 3x + 2y - 17 = 0 C. 2x + 6y - 24 = 0 dan 4x - 5y + 7 = 0

Tentukan himpunan penyelesaian dari

A. 2x - 7y = 17 dan 3x + y = 14
B. 4x - y = - 11dan - 3x + 2y - 17 = 0
C. 2x + 6y - 24 = 0 dan  4x - 5y + 7 = 0

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ARSIE J

09 Desember 2022 06:20

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A) SPLDV Eliminasi 2x - 7y = 17 3x + y = 14 ( ×7) ------‐---------‐---‐-- 2x - 7y = 17 21x + 7y = 98 ------------------- + 23x = 115 x = 5 Substitusi 2x - 7y = 17 2(5) - 7y = 17 10 - 7y = 17 10 - 17 = 7y 7y = -7 y = -1 Himpunan penyelesaian { x = 5 , y= -1 } B) 4x - y = -11 -3x + 2y -17 = 0 ------> -3x + 2y = 17 Eliminasi 4x - y = -11 (×2) -3x + 2y = 17 ------------------------- 8x - 2y = -22 -3x + 2y = 17 ------------------- + 5x = - 5 x = -1 Substitusi -3x + 2y = 17 -3(-1) + 2y = 17 3 + 2y = 17 2y = 17 - 3 2y = 14 y = 7 Himpunan penyelesaian { x = -1 , y = 7 } C) 2x + 6y - 24 = 0 ------> 2x +:6y = 24 4x - 5y + 7 = 0 --------> 4x -5y = -7 Eliminasi 2x + 6y = 24 (×2) 4x - 5y = -7 ------------------------ 4x + 12y = 48 4x - 5y = -7 ------------------- - 17y = 55 y = 55/17 Substitusi 4x - 5y = -7 4x- 5 ( 55/17 ) = -7 4x - 275/17 = -7 68 x - 275 = -119 68x = -119 + 275 68x = 156 x = 156/68 x= 39/17 Himpunan penyelesaian { x = 39/17 , y = 55/17 }


Debby D

09 Desember 2022 06:22

Terima kasih banyak kak, semoga sehat selalu

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Aldo S

09 Desember 2022 06:49

<p>Hallo ,izin menjawab ya.</p><p>A. 2x - 7y = 17...(1).</p><p>&nbsp; &nbsp; &nbsp;3x + y = 14... (2).</p><p>&nbsp; &nbsp; &nbsp;Eliminasi variabel y dari persamaan (1) dan (2)</p><p>&nbsp; &nbsp; &nbsp; 2x - 7y = 17 ... (×1)</p><p>&nbsp; &nbsp; &nbsp;&nbsp;<u>3x + y = 14 &nbsp;...(×-7)</u></p><p>&nbsp; &nbsp; &nbsp; Maka :</p><p>&nbsp; &nbsp; &nbsp; 2x - 7y = 17</p><p>&nbsp; &nbsp; &nbsp;<u> -21x - 7y = -98. &nbsp;-</u></p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 23x= 115</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; x = 115/23</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; x = 5</p><p>Substitusi nilai x=5 dari persamaan (2):</p><p>3x + y = 14</p><p>3(5) + y = 14</p><p>15 + y = 14</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; y = 14 -15&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; y = 1.</p><p>Maka :</p><p>Hp = {5,1}.</p><p>B. 4x - y = -11...(1)</p><p>&nbsp; &nbsp; -3x + 2y - 17 = 0...(2)</p><p>&nbsp; &nbsp; &nbsp;Eliminasi variabel y dari persamaan (1) dan (2):</p><p>&nbsp; &nbsp; &nbsp;4x - y = -11...(×2)</p><p>&nbsp; &nbsp; &nbsp;-3x + 2y - 17 = 0...(×-1)</p><p>&nbsp; &nbsp; &nbsp;Maka:</p><p>&nbsp; &nbsp; &nbsp;8x - 2y = -22</p><p>&nbsp; &nbsp; &nbsp;<u>3x - 2y + 17 = 0. &nbsp;-</u></p><p>&nbsp; &nbsp; &nbsp;5x - 17 = -22</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;5x = -22 + 17</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;5x = -15</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;x = -15/5</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;x = -3</p><p>Substitusi nilai x = -3 dari persamaan (1) :</p><p>4x - y = -11</p><p>4(-3) - y = -11</p><p>-12 - y = -11</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;-y = -11 + 12</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;-y = 1</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; y = -1</p><p>Maka :</p><p>Hp ={-3,-1}</p><p>C. Eliminasi<br>2x + 6y = 24 (×2)<br>4x - 5y = -7<br>------------------------<br>4x + 12y = 48<br>4x - 5y = -7<br>------------------- -<br>17y = 55<br>y = 55/17</p><p>Substitusi<br>4x - 5y = -7<br>4x- 5 ( 55/17 ) = -7<br>4x - 275/17 = -7<br>68 x - 275 = -119<br>68x = -119 + 275<br>68x = 156<br>x = 156/68<br>x= 39/17</p><p>Hp = { 39/17,55/17}</p><p>Semoga membantu.</p>

Hallo ,izin menjawab ya.

A. 2x - 7y = 17...(1).

     3x + y = 14... (2).

     Eliminasi variabel y dari persamaan (1) dan (2)

      2x - 7y = 17 ... (×1)

      3x + y = 14  ...(×-7)

      Maka :

      2x - 7y = 17

      -21x - 7y = -98.  -

                23x= 115

                    x = 115/23

                    x = 5

Substitusi nilai x=5 dari persamaan (2):

3x + y = 14

3(5) + y = 14

15 + y = 14

          y = 14 -15 

          y = 1.

Maka :

Hp = {5,1}.

B. 4x - y = -11...(1)

    -3x + 2y - 17 = 0...(2)

     Eliminasi variabel y dari persamaan (1) dan (2):

     4x - y = -11...(×2)

     -3x + 2y - 17 = 0...(×-1)

     Maka:

     8x - 2y = -22

     3x - 2y + 17 = 0.  -

     5x - 17 = -22

             5x = -22 + 17

             5x = -15

               x = -15/5

               x = -3

Substitusi nilai x = -3 dari persamaan (1) :

4x - y = -11

4(-3) - y = -11

-12 - y = -11

         -y = -11 + 12

         -y = 1

          y = -1

Maka :

Hp ={-3,-1}

C. Eliminasi
2x + 6y = 24 (×2)
4x - 5y = -7
------------------------
4x + 12y = 48
4x - 5y = -7
------------------- -
17y = 55
y = 55/17

Substitusi
4x - 5y = -7
4x- 5 ( 55/17 ) = -7
4x - 275/17 = -7
68 x - 275 = -119
68x = -119 + 275
68x = 156
x = 156/68
x= 39/17

Hp = { 39/17,55/17}

Semoga membantu.


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