Salss S

19 Agustus 2025 08:47

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Salss S

19 Agustus 2025 08:47

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Diketahui sistem persamaan linear dia variabel 4x - y = 13 dan 2x - 3y = 19. Tentukan himpunan penyelesaian dengan metode gabungan

Diketahui sistem persamaan linear dia variabel 4x - y = 13 dan 2x - 3y = 19. Tentukan himpunan penyelesaian dengan metode gabungan

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Happy H

20 Agustus 2025 04:49

<p>a. Eliminasi y pada kedua persamaan&nbsp;</p><p>4x -y = 13 | &nbsp;×3 &nbsp;| 12x-3y = 39</p><p>2x-3y= 19 | &nbsp;×1 &nbsp;| 2x-3y = 19&nbsp;</p><p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;___________-</p><p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10×+0 = 20</p><p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;x = 20/10</p><p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;x = 2</p><p>b. Substitusi x = 2 ke pers.&nbsp; 2</p><p>2x-3y = 19</p><p>2(2)-3y=19</p><p>4-3y = 19</p><p>&nbsp;&nbsp;&nbsp;-3y = 19-4</p><p>&nbsp;&nbsp;&nbsp;-3y = 15</p><p>&nbsp; &nbsp; &nbsp; y = 15/-3</p><p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;y = -5</p><p>Jadi, himpunan penyelesaian dengan metode gabungan (eliminasi &amp; substitusi) adalah (x, y) = (2, -5)</p><p>&nbsp;</p>

a. Eliminasi y pada kedua persamaan 

4x -y = 13 |  ×3  | 12x-3y = 39

2x-3y= 19 |  ×1  | 2x-3y = 19 

                            ___________-

                            10×+0 = 20

                                     x = 20/10

                                     x = 2

b. Substitusi x = 2 ke pers.  2

2x-3y = 19

2(2)-3y=19

4-3y = 19

   -3y = 19-4

   -3y = 15

      y = 15/-3

       y = -5

Jadi, himpunan penyelesaian dengan metode gabungan (eliminasi & substitusi) adalah (x, y) = (2, -5)

 


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Firstofel C

21 Agustus 2025 12:58

<p>Eliminasi y:</p><p>4x - y = 13 &nbsp; &nbsp; &nbsp;. 3 &nbsp; &nbsp; 12x - 3y = 39</p><p>2x - 3y = 19 &nbsp; &nbsp;. 1 &nbsp; &nbsp;&nbsp;<u>2x &nbsp; - 3y = 19</u>&nbsp;<u>&nbsp;</u></p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;10x &nbsp;= 20</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; x = 20 : 10</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<u>x = 2</u></p><p>Subtitusi x:</p><p>2x - 3y &nbsp; &nbsp; = 19</p><p>2 (2) - 3y = 19</p><p>4 - 3y &nbsp; &nbsp; &nbsp; = 19</p><p>&nbsp; &nbsp;- 3y &nbsp; &nbsp; &nbsp; &nbsp;= 19 - 4</p><p>&nbsp; &nbsp;- 3y &nbsp; &nbsp; &nbsp; &nbsp;= 15</p><p>&nbsp; &nbsp; &nbsp; &nbsp; y &nbsp; &nbsp; &nbsp; &nbsp;= 15 : (-3)&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<u>y &nbsp; &nbsp; &nbsp; &nbsp;= -5</u></p><p><u>Jadi, diperoleh (x = 2 &nbsp;dan (y = -5)&nbsp;</u></p>

Eliminasi y:

4x - y = 13      . 3     12x - 3y = 39

2x - 3y = 19    . 1     2x   - 3y = 19  

                                       10x  = 20

                                            x = 20 : 10

                                            x = 2

Subtitusi x:

2x - 3y     = 19

2 (2) - 3y = 19

4 - 3y       = 19

   - 3y        = 19 - 4

   - 3y        = 15

        y        = 15 : (-3) 

        y        = -5

Jadi, diperoleh (x = 2  dan (y = -5) 


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