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<p>1) eliminasi persamaan 1 dan 3 menghasilkan persamaan 4</p><p>2x - y + 3z = -7 &nbsp; &nbsp;....|×1| 2x - y + 3z = -7</p><p>x &nbsp;+ y &nbsp;- z = 3 &nbsp; &nbsp; &nbsp; &nbsp;....|×3| 3x + 3y - 3z = 9</p><p>&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; 5x + 2y = 2 ... (IV)</p><p>2) eliminasi persamaan 2 dan 3 menghasilkan persamaan 5</p><p>2x + 2y - z = 4</p><p>&nbsp; x + &nbsp; y - z = 3</p><p>______________—</p><p>&nbsp; &nbsp; &nbsp; &nbsp; x + y = 1 ... (V)</p><p>3) eliminasi persamaan 4 dan 5 untuk mendapatkan nilai y</p><p>5x + 2y = 2 &nbsp;... |×1| 5x + 2y = 2</p><p>x + y = 1 &nbsp; &nbsp; &nbsp;... |×2| 2x + 2y = 2</p><p>&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;3x = 0 =&gt; <strong>x = 0</strong></p><p>4) substitusi nilai x = 0 ke dalam persamaan 5</p><p>x + y = 1</p><p>0 + y = 1</p><p><strong>y = 1</strong></p><p>5) substitusi nilai x = 0 dan y = 1 ke persamaan 3</p><p>x + y - z = 3</p><p>0 + 1 - z = 3</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; - z = 3 - 1</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<strong>z = -2</strong></p><p>&nbsp;</p><p>jadi, nilai x, y, z yang tepat untuk persamaan tersebut yaitu (0, 1, -2), pilihan jawabannya E</p>