bantu jawab dengan metode subtitusi🙏

<p>Jawaban yang tepat adalah (-1,-2)</p><p>&nbsp;</p><p>Pembahasan :</p><p>8x = 5y + 2 --&gt; 8x - 5y = 2 &nbsp; &nbsp; &nbsp; (1)</p><p>5 - 3x = -4y --&gt; 3x - 4y = 5 &nbsp; &nbsp; &nbsp; (2)</p><p>&nbsp;</p><p>Eliminasi variabel y untuk mendapatkan nilai x</p><p>8x - 5y = 2 &nbsp; (dikali 4) &nbsp;--&gt; 32x - 20y = 8</p><p>3x - 4y = 5 &nbsp; &nbsp;(dikali 5) --&gt; <u>15x - 20y = 25</u> _</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;17x &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = -17</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; x = -17/17</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; x = -1</p><p>&nbsp;</p><p>Substitusikan x = -1 ke persamaan (2)</p><p>3x - 4y = 5</p><p>3(-1) - 4y = 5</p><p>-3 - 4y = 5</p><p>-4y = 5 + 3</p><p>-4y = 8</p><p>y = 8/-4</p><p>y = -2</p><p>&nbsp;</p><p>Jadi Himpunan penyelesaiannya adalah {(-1,-2)}</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p>